#include <bits/stdc++.h>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;

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