#include <iostream>
#include <string>
using namespace std;
int main(){
  string a,b;
  cin>>a;
  cin>>b;
  int aa[26];
  int ab[26];
  for(int i=0; i<26; ++i){
    aa[i]=0;
    ab[i]=0;
  }
  for(int i=0; i<a.size(); ++i){
    int x,y,z;
    x=a[i]-'0';
    y=b[i]-'0';
    z='a'-'0';
    x-=z;
    y-=z;
    aa[x]++;
    ab[y]++;
  }
  for(int i=0; i<26; ++i){
    if(aa[i]!=ab[i]){
      cout<<"NO"<<endl;
      return 0;
    }
  }
  cout<<"YES"<<endl;
  return 0;
}