import sys
dir(sys) #를 심심해서 했는데 stderr를 발견.
sys.stderr = open('error.txt', 'w')

#이 다음부터 발생한 error는 콘솔에 출력되지 않고 파일로 기록됨
#stderr, stdout, stdin 등등도 가능.

open("result.txt","w").write(open("source.txt").readline()[::-1])

#skywave
import sys

#set size
if len(sys.argv) == 1:
	ySize = 3
	xSize = 3
elif len(sys.argv) == 3:
	ySize, xSize = [int(x) for x in sys.argv[1:]]
else:
	print("wrong argument number(s) (arg(s) with 0 or 2 length is allowed)")
	exit()

if min(xSize, ySize) < 1:
	print("wrong list size - size should be positive")
	exit()

totalSize = ySize * xSize

#get input
userInput = [int(x) for x in input("type {0} numbers:".format(totalSize)).split()]

if len(userInput) != totalSize:
	print("wrong number of items ({0} instead of {1})".format(len(userInput), totalSize))
	exit()

#find max
intList = []
for i in range(int(len(userInput) / xSize)):
	intList.append(userInput[i * xSize:(i + 1) * xSize])
	intList[-1].append(max(intList[-1]))

intList.append([])

for i in range(xSize + 1):
	intList[-1].append(max([x[i] for x in intList[:-1]]))

#print
print(intList)

f1 = open('source.txt','r')
f2 = open('result.txt','w')

string = f1.read()
size = len(string)
nstring = string[size::-1]

f2.write(nstring)

f1.close()
f2.close()

nums1 = [0,0,0,0]
nums2 = [0,0,0,0]
nums3 = [0,0,0,0]

for i in range(0,3) :
	number = input()
	nums1[i] = int(number)

for i in range(0,3) :
	number = input()
	nums2[i] = int(number)

for i in range(0,3) :
	number = input()
	nums3[i] = int(number)

for i in range(0,3) :
	bignum = nums1[0]
	if nums1[i]>bignum:
		bignum = nums1[i]
nums1[3] = bignum

for i in range(0,3) :
	bignum = nums2[0]
	if nums2[i]>bignum :
		bignum = nums2[i]
nums2[3] = bignum

for i in range(0,3) :
	bignum = nums3[0]
	if nums3[i]>bignum :
		bignum = nums3[i]
nums3[3] = bignum

square = [nums1,nums2,nums3,[0,0,0,0]]

for i in range(0,4) :
	bignum = square[0][i]
	for j in range(0,4) :
		if square[j][i]>bignum :
			bignum = square[j][i]
	square[3][i] = bignum

for i in range(0,4) :
	for j in range(0,4) :
		bignum = square[0][0]
		if square[i][j]>bignum :
			bignum = square[i][j]

square[3][3] = bignum

for i in range(0,4) :
	print(square[i][0],square[i][1],square[i][2],square[i][3])

source = open('source.txt', 'r')
result = open('result.txt', 'w')

for line in source:
	result.write(line[::-1])

source.close()
result.close()

size = 3
result = []

for i in range(0, size):
	tempList = []
	for j in range(0, size):
		tempList.append(input("result: "))
	tempList.append(max(tempList))
	result.append(tempList)

lastList = []
for i in range(0, size):
	tempList = []
	for j in range(0, size):
		tempList.append(result[j][i])
	lastList.append(max(tempList))

lastList.append(max(lastList))

result.append(lastList)

print(result)

matrix = []

for i in range(3):
	row_max = 0
	row = []
	for j in input().split(" "):
		inputed_number = int(j)
		row.append(inputed_number)
	row.append(max(row))
	matrix.append(row)

row = []

for i in range(4):
	row.append(max(matrix[j][i] for j in range(3)))

row[-1] = max(row)

matrix.append(row)

for row in matrix:
	print(row)

symbol_1 = ['I', 'X', 'C', 'M']
symbol_5 = ['V', 'L', 'D']

while True:
    try:
        user_input = int(input('Input a number (1 ~ 998, 999 to exit)'))
    except Exception:
        print('not valid input')
        continue

    if user_input == 999:
        print('good bye')
        exit()

    if user_input < 1 or user_input > 998:
        print('not valid input (must be 1 ~ 998)')
        continue

    stack = []
    digit = 0
    while user_input > 0:
        current_number = user_input % 10
        current_string = ''
        user_input = int(user_input / 10)

        if current_number % 5 == 4:
            current_string += symbol_1[digit]

            if current_number == 4:
                current_string += symbol_5[digit]
            else:
                current_string += symbol_1[digit + 1]

        else:
            if current_number > 4:
                current_number -= 5
                current_string += symbol_5[digit]

            current_string += symbol_1[digit] * current_number

        stack.append(current_string)
        digit += 1

    while stack:
        print(stack.pop(), end='')

    print()

while True:
    try:
        user_input = int(input('Input a number (input < 1 to exit)'))
    except Exception:
        print('not valid input')
        continue

    if user_input < 1:
        print('good bye')
        exit()

    user_input -= 1
    result = ['0', '1']
    
    while user_input > 0:
        length = len(result)
        result *= 2

        for i in range(length):
            result[i] = '0' + result[i]
            result[i + length] = '1' + result[i + length]
        
        user_input -= 1


    print(result)

source = open('source.txt','r')
result = open('result.txt','w')

for line in source:
    romanNum=''
    isEmpty = line
    if isEmpty=='':break
    temp=int(isEmpty)
    if temp<=0:
        print('Too Small!')

    elif temp>999:
        print('Too Big!')

    elif temp==999:
        exit()

    else:
        while temp>=500:
            temp-=500
            romanNum+='D'

        while temp>=100:
            temp-=100
            romanNum+='C'

        while temp>=50:
            temp-=50
            romanNum+='L'
    
        while temp>=10:
            temp-=10
            romanNum+='X'

        if temp==1:
            romanNum+='I'
        elif temp==2:
            romanNum+='II'
        elif temp==3:
            romanNum+='III'
        elif temp==4:
            romanNum+='IV'
        elif temp==5:
            romanNum+='V'
        elif temp==6:
            romanNum+='VI'
        elif temp==7:
            romanNum+='VII'
        elif temp==8:
            romanNum+='VIII'
        elif temp==9:
            romanNum+='IX'
        romanNum+='\n'

    result.write(romanNum)

source.close()
result.close()

import random

def cowsnbulls(answer_length):
    if type(answer_length) != int:
        print('answer_length must be a number')
        return

    if not 1 <= answer_length <= 10:
        print('answer_length must be between 1 and 10')
        return
    
    answer = []
    numbers = list(range(10))
    playing = True

    while len(answer) < answer_length:
        answer.append(numbers.pop(random.randrange(len(numbers))))

    print(answer)
    print('Welcome to the Cows Bulls Game!')
    print('Enter a number:')

    while playing:
        try:
            user_input = [int(x) for x in list(input('>>> '))]
        except Exception:
            print('try again')
            continue

        if len(user_input) != answer_length:
            print('try again')
            continue

        if len([True for x in user_input for y in user_input if x == y]) != answer_length:
            print('try again')
            continue

        cows = len([True for x, y in zip(user_input, answer) if x == y])
        bulls = len([True for x, y in enumerate(user_input) for z, w in enumerate(answer) if y == w and x != z])

        print('{0} cow{1}, {2} bull{3}'.format(cows, 's' if cows > 1 else '', bulls, 's' if bulls > 1 else ''))

        if bulls == answer_length:
            playing = False

if __name__ == '__main__':
    cowsnbulls(4)

import random

answer = random.sample(range(10),4)
while True:
	guess = []
	error = 0
	cow = 0
	bull = 0

	nums = input("Enter a number ")

	for x in nums:
		guess.append(int(x))

	if len(guess) != 4:
		print("Wrong lenth")
		continue

	for n in range(0,4):
		for m in range(n+1,4):
			if guess[n] == guess[m]:
				error += 1

	if error > 0:
		print("Wrong number")
		continue

	for x in range(0,4):
		if answer[x] == guess[x]:
			cow += 1
	for n in range(0,4):
		for m in range(0,4):
			if n==m:
				continue
			if guess[n] == answer[m]:
				bull += 1

	if cow>1:
		print(cow,'cows'+' ')
	else:
		print(cow,'cow'+' ')

	if bull>1:
		print(bull,'bulls'+' ')
	else:
		print(bull,'bull'+' ')
	
	if cow == 4:
		print('Win')
		break

import random

print("Welcome to the Cows and Bulls Game!")
answer = random.sample(range(10), 4)

while(True):
	try:
		input_list = list(map(int, list(input("Enter a number : "))))
	except ValueError:
		continue
	finally:
		pass

	if len(input_list) != 4:
		continue
		
	cow = 0
	bull = 0

	if answer == input_list:
		print("good, kids.")
		break
	else:
		for i in range(4):
			if input_list[i] == answer[i]:
				cow+=1
			elif input_list[i] in answer:
				bull+=1

	print("your input : ", input_list)
	print("cow : ", cow, " bull : ", bull)

print(answer)