#include<stdio.h>
#include<iostream>
using namespace std;

int a, b, c;
int in1, in2;

int main() {
	scanf("%d.%d.%d",&a,&b,&c);
	in1 = a*1000000 + b*1000 + c;
	scanf("%d.%d.%d",&a,&b,&c);
	in2 = a*1000000 + b*1000 + c;
	if( in1 >= in2 ) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
	return 0;
}