#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[])
{
    unsigned int a,b;
    int c,i,counter;
    while(1){
        counter=0;
        scanf("%ld%ld",&a,&b);
        if(a==0&&b==0) break;
        c=0;
        while(1){
            if(a==0&&b==0) break;
            c=(a%10+b%10+c)/10;
            if(c>0) counter++;
            a=a/10;b=b/10;
        }
        if(counter==0) printf("No carry operation.\n");
        else{if(counter>1) printf("%d carry operations.\n",counter);
        else{printf("%d carry operation.\n",counter);}}
    }
    return 0;
}