#include <algorithm>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <string>
#include <vector>
using namespace std;
typedef long long int ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;

#define rep(i,x) for(int i=0;i<(int)(x);++i)
#define reps(i,x) for(int i=1;i<=(int)(x);++i)
#define rrep(i,x) for(int i=((int)(x)-1);i>=0;i--)
#define rreps(i,x) for(int i=((int)(x));i>0;i--)
#define pb push_back

double x = 0, y = 0;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    string a, b; cin >> a >> b;
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    cout << (a == b ? "YES" : "NO") << "\n";
    return 0;
}