#include<iostream>
#include<vector>
#include<algorithm>
#include<cstdio>
#include<cmath>
using namespace std;
int main(){
    int table1[26]={0},table2[26]={0};
    string s1,s2;
    cin >> s1 >> s2;
    for(int i=0;s1[i]!='\0';i++){
        table1[s1[i]-'a']++;
    }
    for(int i=0;s2[i]!='\0';i++){
        table2[s2[i]-'a']++;
    }
    for(int i=0;i<26;i++){
        if(table1[i]!=table2[i]){
            cout << "NO";
            return 0;
        }
    }
    cout << "YES";
    return 0;
}