/*
    No.138 化石のバージョン
    https://yukicoder.me/problems/no/138
*/
#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    // A.B.C
    string first, second;
    cin >> first;
    cin >> second;

    if (first == second) {
        cout << "YES" << endl;
        return 0;
    } else {
        if (first[0] > second[0]) {
            cout << "YES" << endl;
            return 0;
        } else if (first[0] < second[0]) {
            cout << "NO" << endl;
            return 0;
        } else {
            // A is same
            if (first[2] > second[2]) {
                cout << "YES" << endl;
                return 0;
            } else if (first[2] > second[2]) {
                cout << "NO" << endl;
                return 0;
            } else {
                // B is same
                if (first[4] > second[4]) {
                    cout << "YES" << endl;
                    return 0;
                } else if (first[4] > second[4]) {
                    cout << "NO" << endl;
                    return 0;
                } else {
                    // C is same
                }
            }
        }
    }

    return 0;
}