#include <bits/stdc++.h>
using namespace std;
int main()
{
long int a,b,x,y;
while(cin >> a >> b)
{
if (a == 0 && b == 0) break;
long int count=0,c=0;
while( a > 0 || b > 0)
{
count = (a%10 + b%10 + count)/10;
a/= 10;
b /= 10;
if (count) c++;
}
if (c == 0) printf ("No carry operation.\n");
else if(c==1)
printf("%ld carry operation.\n",c);
else
printf("%ld carry operations.\n",c);
}
return 0;
}