{{{~cpp
#include <iostream>
using namespace std;

int input1[10], input2[10], carry[10], number1, number2;
int counting, i, j, k;
char temp;

void getCarryNum()
{
	counting=0;
	for(i=0; i<10; i++)
		carry[i]=0;
	for(i=number1-1, j=number2-1, k=9; i>=0 || j>=0; i--, j--, k--)
	{
		if(i<0)
		{
			if(input2[j] + carry[k]>9)
			{
				carry[k-1]=1;
				counting++;
			}
		}
		else if(j<0)
		{
			if(input1[i] + carry[k]>9)
			{
				carry[k-1]=1;
				counting++;
			}
		}
		else
		{
			if(input1[i] + input2[j] + carry[k]>9)
			{
				carry[k-1]=1;
				counting++;
			}
		}
	}
	if(counting==0)
		cout << "No carry operation." << endl;
	else if(counting==1)
		cout << "1 carry operation." << endl;
	else
		cout << counting << " carry operations." << endl;
}

int main()
{
	while(true)
	{
		number1=0;
		while(cin.peek()!=' ')
		{
			cin >> temp;
			input1[number1++] = temp-48;
		}
		number2=0;
		while(cin.peek()!='\n')
		{
			cin >> temp;
			input2[number2++]= temp-48;
		}
		if(input1[0]==0 && input2[0]==0)
			break;
		getCarryNum();
	}
	return 0;
}
}}}