#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>
#define INF 1050000000
#define SIZE 300
#define MOD 1000000007

using namespace std;


int main()
{
	string s1, s2;

	cin >> s1 >> s2;
	int a, b;

	a = (s1[0] - '0') * 100 + (s1[2] - '0') * 10 + (s1[4] - '0') * 1;
	b = (s2[0] - '0') * 100 + (s2[2] - '0') * 10 + (s2[4] - '0') * 1;
	
	if (a >= b) cout << "YES" << endl;
	else cout << "NO" << endl;

	return (0);
}