#include <iostream>
using namespace std;
//scanfｷﾓﾁｨｨｨｨｨｨｨｨｨｨ

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