#include <bits/stdc++.h>
#define rep(i,n) for(int i=0; i<(n); i++)
using namespace std;
typedef long long ll;

int main(){
	string s1,s2; cin>>s1>>s2;
	
	rep(i,3){
		int n1=s1.find(".");
		int n2=s2.find(".");
		string f1=s1.substr(0,n1);
		string f2=s2.substr(0,n2);
		s1.replace(0,n1+1,"");
		s2.replace(0,n2+1,"");
	
		if(f1>f2){
			cout << "YES" << endl;
			return 0;
		} else if(f1<f2){
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "NO" << endl;
}