/* -*- coding: utf-8 -*-
 *
 * 2863.cc:  No.2863 Base 10 Subsets 1 - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int a, b;
  scanf("%d%d", &a, &b);
  
  while (a > 0 || b > 0) {
    int ai = a % 10, bi = b % 10;
    if (ai < bi) { puts("No"); return 0; }
    a /= 10, b /= 10;
  }

  puts("Yes");
  return 0;
}