#include<iostream>
#include<ctime>

using namespace std;

int main() {
	int a, b;
	srand(time(0));
	while (1) {
		a = rand() % 16;
		b = rand() % 16;
		while (1) {
			int c;
			cout << hex << uppercase << a << " + " << b << " = ";
			cin >> hex >> c;

			if (c == a + b) {
				cout << "Yes!" << endl;
				break;
			}

			else if (c != a + b) {
				cout << "No!" << endl;
				continue;
			}
			
		}
		
	}
	
}