#include <iostream>
using namespace std;

int main() {
    int A_0, B_0, C_0, A_1, B_1, C_1;
    scanf("%d.%d.%d", &A_0, &B_0, &C_0);
    scanf("%d.%d.%d", &A_1, &B_1, &C_1);
    int old, now;
    old = A_0 * 1000000 + B_0 * 1000 + C_0;
    now = A_1 * 1000000 + B_1 * 1000 + C_1;
    if (now <= old) { cout << "YES" << "\n"; }
    else { cout << "NO" << "\n"; }
}