#include <iostream>
using namespace std;
int main () {
char op;
float a, b;
cin >> a >> b;
cin >> op;
if (op == '+')
cout << "sum" << a + b << endl;
if (op == '-')
cout << "diff" << a - b << endl;
if (op == '*')
cout << "prod" << a * b << endl;
if (op == '/')
cout << "divide" << a / b << endl;
return 0;
}
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