include stdio long long int cr res int main void while scanf lld lld r

#include <stdio.h>
long long a,b;
int cr,res;
int main (void)
{
 while(scanf("%lld %lld",&a,&b),a+b>0)

{
  res =0; 
  cr = 0;
  while((a > 0) || (b > 0))
  { 
    if (a%10 + b%10 + cr > 9)

    {
      cr = 1;res++;
    }
    else cr = 0;
    a /= 10; b /= 10;
  }


if (!res) printf("No "); else printf("%d ",res);
printf("carry operation");
if (res > 1) printf("s.\n"); else printf(".\n");
}
}