View Code of Problem 3689

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main() {
	int t;
	int k = 1;
	cin >> t;
	while (t--) {
		
		int a, b;
		cin >> a >> b;
		cout << "Case #" << k++ << ":" << endl;
		cout << a - b << endl;
	}
	return 0;
}