#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000000

int main(){
	
	vector<array<int,3>> a(2);
	rep(i,2){
		scanf("%d.%d.%d",&a[i][0],&a[i][1],&a[i][2]);
	}
	if(a[1]<=a[0])cout<<"YES"<<endl;
	else cout<<"NO"<<endl;
	
	return 0;
}