#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 


int main()
{

  CIN( string , S0 );
  CIN( string , S1 );
  S0 += ".";
  S1 += ".";

  string S[2] = { S0 , S1 };
  ll A[2] = {};

  for( ll i = 0 ; i < 2 ; i++ ){

    const string& Si = S[i];
    const uint& size = Si.size();
    ll& Ai = A[i];
    ll d = 0;

    for( ll j = 0 ; j < size ; j++ ){

      const string c = Si.substr( j , 1 );

      if( c == "." ){

	Ai = Ai * 1000 + d;
	d = 0;

      } else {

	d = d * 10 + stoi( c );

      }

    }
    
  }

  const string answer = A[0] < A[1] ? "NO" : "YES";
  cout << answer << endl;
  return 0;

}