#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main(void) {
    string a,b;
    cin >> a;
    cin >> b;
    if (a == to_string(stoi(a)) && b == to_string(stoi(b))) cout << "YES" << endl;
    else cout << "NG" << endl;
    return 0;
}