#include <stdio.h>
#include <algorithm>
#include <deque>
using namespace std;
using ll = long long;

//138
int main() {
	int a[2], b[2], c[2];
	scanf("%d.%d.%d", a, b, c);
	scanf("%d.%d.%d", a + 1, b + 1, c + 1);

	if (a[1] != a[0])
		printf("%s\n", a[1] < a[0] ? "YES" : "NO");
	else if (b[1] != b[0])
		printf("%s\n", b[1] < b[0] ? "YES" : "NO");
	else
		printf("%s\n", c[1] <= c[0] ? "YES" : "NO");
}