#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>

using namespace std;

int main()
{	
	vector<int> a,b;
	string s;
	cin>>s;

	for(int i=0;i<s.size();i++){
		a.push_back(s[i]-'a');
	}

	cin>>s;
	for(int i=0;i<s.size();i++){
		b.push_back(s[i]-'a');
	}

	sort(a.begin(),a.end());
	sort(b.begin(),b.end());

	for(int i=0;i<s.size();i++){
		if(a[i]!=b[i]){cout<<"NO"<<endl; return 0;}
	}

	cout<<"YES"<<endl;

}