/*
    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;

    int f[3] = {
        (int)first[0],
        (int)first[2],
        (int)first[4],
    };

    int s[3] = {
        (int)second[0],
        (int)second[2],
        (int)second[4],
    };

    if (first == second) {
        cout << "YES" << endl;
    } else {
        if (f[0] > s[0]) {
            cout << "YES" << endl;
        } else if (f[0] < s[0]) {
            cout << "NO" << endl;
        } else {
            // A is same
            if (f[1] > s[1]) {
                cout << "YES" << endl;
            } else if (f[1] < s[1]) {
                cout << "NO" << endl;
            } else {
                // B is same
                if (f[2] > s[2]) {
                    cout << "YES" << endl;
                } else if (f[2] < s[2]) {
                    cout << "NO" << endl;
                } else {
                    // C is same
                }
            }
        }
    }

    return 0;
}