#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string a, b;
  cin >> a >> b;
  sort(a.begin(), a.end());
  sort(b.begin(), b.end());
  cout << (a == b ? "YES" : "NO") << endl;
  return 0;
}