#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
using vll=vector<ll>;
using pll=pair<ll,ll>;

using mint=modint;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

    string A,B;
    cin>>A>>B;
    vll f(26,0);
    for(auto a:A)f[a-'a']++;
    for(auto b:B)f[b-'a']--;
    for(auto x:f){
        if(x!=0){
            cout<<"NO"<<endl;
            return 0;
        }
    }
    cout<<"YES"<<endl;
}