#include <bits/stdc++.h>

inline long nextInt(void) {
  long temp;
  std::cin >> temp;
  return temp;
}

int main() {

  int c1[256] = {};
  int c2[256] = {};
  std::string str1;
  std::string str2;
  bool b = true;

  std::cin >> str1;
  std::cin >> str2;

  for(int i = 0; i < str1.size(); ++i) {
    ++c1[str1[i]];
  }
  for(int i = 0; i < str2.size(); ++i) {
    ++c2[str2[i]];
  }

  b = true;
  for(int i = 0; i < 256; ++i) {
    if( c1[i] != c2[i] ) {
      b = false;
      break;
    }
  }

  if( b ) {
    std::cout << "YES" << std::endl;
  }
  else {
    std::cout << "NO" << std::endl;
  }
  
    
  return 0;
}