#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef pair<int,int> P;
 
const int INF = 1e9;
const int mod = 1e9+7;
const double EPS = 1e-10;
const double PI = acos(-1.0);
 
int main()
{
    string s,t;
    cin >> s >> t;
    sort(s.begin(),s.end());
    sort(t.begin(),t.end());
    cout << (s == t ? "YES" : "NO") << endl;
    return 0;
}