#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
#define per(i,n,a) for (int i = n-1;i >= a;i--)
using namespace std;

int main() {
    int a0, b0, c0;
    int a1, b1, c1;
    scanf("%d.%d.%d", &a0, &b0, &c0);
    scanf("%d.%d.%d", &a1, &b1, &c1);
    if (a0 * 1000000 + b0 * 1000 + c0 >= a1 * 1000000 + b1 * 1000 + c1){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;
    }
}