#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <algorithm>
#include <functional>
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cctype>
#include <string>

using namespace std;

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]);
  bool yes = true;
  for (int i = 0; i < 3; i++) {
    if (a[i] == b[i]) continue;
    if (a[i] < b[i]) yes = false;
    break;
  }
  if (yes) {
    std::cout << "YES" << std::endl;
  }else {
    std::cout << "NO" << std::endl;
  }
}