#include<stdio.h>

int main()
{
    long long int a,b;
    while(scanf("%lld %lld",&a,&b)==2)
    {
        if(a==0&&b==0)
            break;
        int ara[2][10]={0};
        int k=9;
        int l=9;
        while(1)
        {
            ara[0][k]=a%10;
            a=a/10;
            k--;
            if(a<1)
                break;
        }
        while(1)
        {
            ara[1][l]=b%10;
            b=b/10;
            l--;
            if(b<1)
                break;
        }
        int counnt=0;
        int flag=0;
        for(int z=9;z>=0;z--)
        {
            if(flag==0)
            {
                if(ara[0][z]+ara[1][z]>9)
                {
                    flag=1;
                    counnt++;
                }
            }
            else
            {
                if(ara[0][z]+ara[1][z]+1>9)
                {
                    counnt++;
                }
                else
                    flag=0;
            }
            if(ara[0][z-1]==0&&ara[0][z-1]==0)
                break;
        }
        if(counnt==0)
            printf("No carry operation.\n");
        else if(counnt==1)
            printf("1 carry operation.\n");
        else
            printf("%d carry operations.\n",counnt);
    }
}