#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
#include <ctype.h>
#include <string>
using namespace std;
#define INIT cin.tie(0); ios::sync_with_stdio(false);
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)

int main()
{
    INIT;

    string a;
    string b;
    cin >> a >> b;

    int A[a.size()], B[b.size()];
    REP(i, a.size()){
        A[i] = char(a[i]);
        B[i] = char(b[i]);
    }
    sort(A, A + a.size());
    sort(B, B + b.size());

    int f = 1;
    REP(i, a.size()){
        if(A[i] != B[i]){
            f = 0;
            break;
        }
    }
    if(f == 1) cout << "YES" << endl;
    else cout << "NO" << endl;
    
    return 0;
}