~cpp
#include <iostream>
using namespace std;
#include <math.h>

int numlen(int num)   
{   
    int turn = 0;   
    while(num >= 10)   
    {   
        num /= 10;   
        turn++;   
    }   
    return (turn+1); 
	
}   

int process(int n1, int n2)
{
	int nums1[11], nums2[11];
	int i, max_len, big_num, small_num, num1_len, num2_len, operation = 0;
	num1_len = numlen(n1);
	num2_len = numlen(n2);
	
	if(num1_len > num2_len)
		max_len = num1_len;
	else 
		max_len = num2_len;
	
	if(n1 >= n2)
	{
		big_num = n1;
		small_num = n2;
	} else {
		big_num = n2;
		small_num = n1;
	}
	
	for(i = numlen(small_num); i <= max_len+1; i++)
	{
		nums2[i] = 0;
	}
	nums1[max_len] = 0;
	nums2[max_len+1] = 0;
	for(i = 0; i < numlen(big_num); i++)            // 나누어 넣기   
	{   
		nums1[i] = big_num / pow(10, i);   
		nums1[i] = nums1[i] % 10;   
	}   
	for(i = 0; i < numlen(small_num); i++)            // 나누어 넣기   
	{   
		nums2[i] = small_num / pow(10, i);   
		nums2[i] = nums2[i] % 10;   
	}
	
	for(i = 0; i < max_len; i++)
	{
		if((nums1[i]+nums2[i]) >= 10)
		{
			++operation;
			nums1[i+1] += 1;
		}
	}

	
	return operation;
}

int main() 
{
	int n1, n2, operation;
	while(cin >> n1 >> n2)
	{
		if(n1 == 0 && n2 == 0)
			break;
		operation = process(n1,n2);
		
		//output
		if(operation == 0)
			cout << "No carry operation." << endl;
		else if(operation == 1)
			cout << "1 carry operation." << endl;
		else 
			cout << operation << " carry operations." << endl;
		
	}
	
	return 0;
}