#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
  string a,b;
  cin>>a>>b;
  vector<int> cnta(26,0);
  vector<int> cntb(26,0);
  for(char x : a){
  	int n=x-'a';
  	cnta.at(n)++;
  }
  for(char x : b){
  	int n=x-'a';
  	cntb.at(n)++;
  }
  if(cnta==cntb) cout<<"YES"<<endl;
  else cout<<"NO"<<endl;
}