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

#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 a[6], b[6];

	cin >> a >> b;

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