#include<iostream>
#include<string>
using namespace std;

int main(){
    int S,T,F=0;
    string c;

    cin >> S >> T >> c;
    
    if (c=="<"){
        if (S<T) F=1;
    }else if (c==">"){
        if (S>T) F=1;
    }
    else{
        if (S==T) F=1;
    }
    
    if (F==1) cout << "YES" << endl;
    else cout << "NO" << endl;
}