#include <iostream>
#include <vector>
#include <numeric>
#include <climits>
#include <cstdlib>
#include <functional>
#include <iostream>
#include <queue>
#include <vector>
#include <algorithm> 
#include <map>


#define ALL(v) (v).begin(),(v).end()
#define REP(i,p,n) for(int i=p;i<(int)(n);++i)
#define rep(i,n) REP(i,0,n)
#define dump(a) (cerr << #a << "=" << (a) << endl)
#define DUMP(list) cout << "{"; for(auto nth : list){ cout << nth << " ";}cout << "}" << endl;

using namespace std;

int strCount[26]={0};

int main() {

	string str1,str2;
		
	cin >> str1 >> str2;

	rep(i,str1.length()){
		strCount[(str1[i] - 'a')]++;	
		strCount[(str2[i] - 'a')]--;
	}

	rep(i,26){
		if(strCount[i]!=0){
			cout << "NO" << endl;
			return 0;
		}
	}

	cout << "YES" << endl;
}