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

int input() {
    auto f = [](char c) -> int { return (c - '0'); };
    string s;
    cin >> s;
    return f(s[0]) * 100 + f(s[2]) * 10 + f(s[4]);
}

int main() {
    int a = input(), b = input();
    cout << (a < b ? "NO" : "YES") << '\n';
    return 0;
}