#include<iostream>
using namespace std;
main(){
	string s,t;cin>>s>>t;
	int a[26]={},b[26]={};
	for(int i=0;i<s.size();i++)a[s[i]-'a']++,b[t[i]-'a']++;
	for(int i=0;i<26;i++)if(a[i]-b[i]){cout<<"NO"<<endl;return 0;}
	cout<<"YES"<<endl;
}