#include <bits/stdc++.h>

using namespace std;

typedef pair<int,int> P;
typedef pair<int,pair<int,int>> PP;
typedef long long ll;

const double EPS = 1e-8;
const int INF = 1e9;
const int MOD = 1e9+7;

int dy[] = {0,1,0,-1};
int dx[] = {1,0,-1,0};

int main(void) {
	string a,b;
	cin >> a >> b;
	sort(a.begin(),a.end());
	sort(b.begin(),b.end());
	if(a == b)cout << "YES" << endl;
	else cout << "NO" << endl;

	return 0;
}