#include <bits/stdc++.h>
using namespace std;

int main()
{
    string A, B;
    map<char,int> Amap;
    map<char,int> Bmap;
    cin >> A >> B;

    for (int i = 0; i < A.size(); ++i){
        char c;
        Amap[c] = 0; 
        Bmap[c] = 0; 
    }
    
    for (int i = 0; i < A.size(); ++i){
        char c = A[i];
        Amap[c] += 1; 
    }


    for (int i = 0; i < A.size(); ++i){
        char c = B[i];
        Bmap[c] += 1; 
    }

    if (Amap == Bmap){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;        
    }

    return 0;
}