#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;

int main(){
	int a,b,c;
	int d,e,f;
	scanf("%d.%d.%d",&a,&b,&c);
	scanf("%d.%d.%d",&d,&e,&f);
	int fossil=100*a+10*b+c;
	int ver = 100*d+10*e+f;
	if(fossil >= ver)cout << "YES" <<endl;
	else cout << "NO" << endl;
}