#include<bits/stdc++.h>
#define mod 1000000007
using namespace std;

int main()
{
  string A,B;cin>>A>>B;
  int alphaA[26]={},alphaB[26]={};
  for(int i=0;i<(int)A.size();i++)alphaA[A[i]-'a']++,alphaB[B[i]-'a']++;
  for(int i=0;i<26;i++)if(alphaA[i]!=alphaB[i]){printf("NO\n");return 0;}
  printf("YES\n");
}