#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000

using namespace std;


int main(void) {
	char s[6];
	char t[6];
	cin >> s >> t;

	if (t[0] < s[0]) {
		cout << "YES" << endl;
	}
	else if (t[0] > s[0]) {
		cout << "NO" << endl;
	}
	else {
		if (t[2] < s[2]) {
			cout << "YES" << endl;
		}
		else if (t[2] > s[2]) {
			cout << "NO" << endl;
		}
		else {
			if (t[4] <= s[4]) {
				cout << "YES" << endl;
			}
			else if (t[4] > s[4]) {
				cout << "NO" << endl;
			}
		}
	}
	return 0;
}