#include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <iomanip>
#include <algorithm>
using namespace std;
using ll = long long;

int main() {
    int a, b, c, d, e, f;
    scanf("%d.%d.%d", &a, &b, &c);
    scanf("%d.%d.%d", &d, &e, &f);
    if(a*100+b*10+c >= d*100+e*10+f) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
}