#include<stdio.h>
#include<iostream>
using namespace std;

int main()
{
    long long int a,b,t;
    int mod_b,mod_a,c;
    while(1)
    {
        cin>>a>>b;

        if(a==0&&b==0)
        break;

        c=0;

        int carry=0;
        while(a||b)
        {
            mod_b=b%10;
            mod_a=a%10;
            if(mod_a+mod_b+carry>9)
            {
                c++;
                b=b/10;
                a=a/10;
                carry=1;
            }
            else
            {
                b=b/10;
                a=a/10;
                carry=0;
            }
        }

        if(c==0)
        cout<<"No carry operation.";
        else if(c==1)
        cout<<"1 carry operation.";
        else
        cout<<c<<" carry operations.";
        cout<<endl;
    }
    return 0;
}