#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<stdlib.h>
#include<vector>
#include<string>
#include<sstream>
#include<math.h>
using namespace std;


int main(){

  int a[3];
  int b[3];
  scanf("%d.%d.%d\n", &a[0], &a[1], &a[2]);
  scanf("%d.%d.%d", &b[0], &b[1], &b[2]);

  if( a[0] < b[0] || ( a[0] == b[0] && a[1] < b[1] )
  || ( a[0] == b[0] && a[1] == b[1] && a[2] < b[2] ) ) cout << "NO" << endl;
  else cout << "YES" << endl;

  return 0;
}