#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
ll a[26] = {0};
ll b[26] = {0};
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    str s1, s2;
    cin >> s1 >> s2;
    for (ll i = 0; i < s1.size(); i++) a[s1[i] - 'a']++;
    for (ll i = 0; i < s2.size(); i++) b[s2[i] - 'a']++;
    for (ll i = 0; i < 26; i++)
    {
        if (a[i] == b[i]) continue;
        cout << "NO\n";
        return 0;
    }
    cout << "YES\n";
    return 0;
}