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

int main(){
  vector<int> x(3),y(3);
  scanf("%d.%d.%d\n",&x[0],&x[1],&x[2]);
  scanf("%d.%d.%d",&y[0],&y[1],&y[2]);
  cout << (x>=y?"YES":"NO")<<endl;
  return 0;
}