#include "iostream"
#include "string"
const int MAX = 11;
using namespace std;
char a[MAX],b[MAX],a1[MAX],b1[MAX];
int main(void)
{
	int m,n,i,add,Max,temp,ans;
	while(scanf("%s%s",a,b) != EOF)
	{
		memset(a1,'0',sizeof(a1));
		memset(b1,'0',sizeof(b1));
		if(a[0] == 0 && b[0] == 0 && strlen(a) == 1 && strlen(b) ==1)
			break;
		ans = 0;
		m = strlen(a);
		n = strlen(b);
		for(i=m-1;i>=0;i--)
			a1[m-i-1] = a[i];
		for(i=n-1;i>=0;i--)
			b1[n-i-1] = b[i];
//		puts(a1);
//		puts(b1);
		add = 0;
		Max = m>n?m:n;
		for(i=0;i<Max;i++)
		{
			if(add == 0)
			{
				temp = a1[i]-'0' + b1[i]-'0';
				if(temp >= 10)
				{
					ans++;
					add = 1;
				}
				else
					add = 0;
			}
			else
			{
				temp = a1[i]-'0' + b1[i]-'0' + add;
				if(temp >= 10)
				{
					ans++;
					add = 1;
				}
				else
					add = 0;
			}
		}
		if(ans == 0)
			cout<<"No carry operation."<<endl;
		else if(ans == 1)
			cout<<"1 carry operation."<<endl;
		else
			cout<<ans<<" carry operations."<<endl;
	}
	return 0;
}