#include
using namespace std;
void output(int& n1, int& n2)
{
int count = 0;
bool flag = false;
while(n1 n2)
{
int sum = n1 % 10 + n2 % 10;
if(flag) ++sum;
flag = false;
if(sum > 9)
{
flag = true;
++count;
}
n1 /= 10;
n2 /= 10;
}
if(count == 0) cout << "No carry operation." << endl;
else if(count == 1) cout << "1 carry operation." << endl;
else cout << count << " carry operations." << endl;
}
int main()
{
int n1, n2;
while(cin >> n1 >> n2)
{
if(!n1 && !n2) break;
output(n1, n2);
}
return 0;
}
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