#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ul;
typedef signed long long ll;
ul over = 1000000007;

int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed;
  string a, b;
  cin >> a >> b;
  int cnt[26];
  fill(cnt, cnt+26, 0);
  for (int i = 0; i < a.size(); ++i) {
    cnt[a[i]-'a']++;
    cnt[b[i]-'a']--;
  }
  for (int i = 0; i < 26; ++i) {
    if (cnt[i] != 0) {cout << "NO" << endl; return 0;}
  }
  cout << "YES" << endl;
  return 0;
}