#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
#define per(i,n,a) for (int i = n-1;i >= a;i--)
using namespace std;

int main() {
    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;
    }
}