#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
const int mod=1000000007;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	string s,t;cin >> s >> t;
	sort(s.begin(),s.end());
	sort(t.begin(),t.end());
	if(s==t) cout << "YES" << endl;
	else cout << "NO" << endl;
}