#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    
    int a[26] = {0};
    int b[26] = {0};
    string A, B;
    cin >> A >> B;
    
    for ( int i = 0; i < A.length(); i++ ) {
        a[ A[i] - 'a' ]++;
        b[ B[i] - 'a' ]++;
    }
    
    for ( int i = 0; i < 26; i++ ) {
        if ( a[i] != b[i] ) { cout << "NO" << endl; return 0; } 
    }
    cout << "YES" << endl;
    
    return 0;
}