#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pll pair<ll,ll>
#define ff first
#define ss second
#define pb push_back
const int mod = 1e9 + 7;



int main() {
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	
	string s, t, c;
	cin >> s >> t >> c;
	if(c == "<"){
		if(s < t) cout << "YES";
		else cout << "NO";
	}
	else if(c == ">"){
		if(s > t) cout << "YES";
		else cout << "NO";
	}
	else {
		if(s == t) cout << "YES";
		else cout << "NO";
	}
	
	
	return 0;

}