#include<stdio.h>
int main()
{
    int a, b, r1, r2, r3=0, sum, ct;
    while(scanf("%d%d",&a,&b)==2){
            if(a==0 && b==0){
                break;
            }
            sum=0;
            ct=0;
            r3=0;
        while(a!=0 && b!=0){
            r1=a%10;
            r2=b%10;
            sum=r1+r2+r3;
            r3=0;
            if(sum>9){
                    ct++;
                while(sum!=0){
                    r3=sum%10;
                    sum/=10;
                }
            }
            a/=10;
            b/=10;
        }
        if(ct==0){
            printf("No carry operation.\n");
        }
        else{
            printf("%d carry operations.\n",ct);
        }
    }
    return 0;
}