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

int main(){
  string S, T;
  char c;
  cin >> S >> T >> c;
  
  if(c == '<') cout << (S < T ? "YES" : "NO");
  if(c == '>') cout << (S > T ? "YES" : "NO");
  if(c == '=') cout << (S == T ? "YES" : "NO");
}