#include <bits/stdc++.h>
using namespace std;

int main(){
  string S,T;
  cin>>S>>T;
  int len=S.length();
  map<char,int>mps;
  map<char,int>mpt;
  for(int i=0;i<len;i++){
    mps[S.at(i)]++;
    mpt[T.at(i)]++;
  }
  for(char a='a';a<'z'+1;a++){
    if(mps[a] != mpt[a]){
      cout<<"NO"<<endl;
      return 0;
    }
  }
  cout<<"YES"<<endl;
  return 0;
}