#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>

using namespace std;

int main(void)
{
	vector<int> v1(3), v2(3);

	scanf("%d.%d.%d", &v1[0], &v1[1], &v1[2]);

	scanf("%d.%d.%d", &v2[0], &v2[1], &v2[2]);

	if(v1 >= v2) cout << "YES" << endl;
	else		 cout << "NO" << endl;

	return (0);
}