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


 
int main(){
  string a, b;
  cin >> a >> b;
 string str1 = regex_replace(a,regex("."),"a");
 string str2 = regex_replace(b,regex("."),"a");
 int c = atoi(str1.c_str());
 int d = atoi(str2.c_str());
  if(c<d) cout << "NO";
  else cout << "YES";
  return 0;
  
 
}