#include <iostream>
using namespace std;

string ReadLine(){
    char str[11];
    cin >> str;
    return str;
}

int main(){
    auto a   =ReadLine();
    auto b   =ReadLine();
    int size =a.size();
    for(int i=0;i<size; i++){
        for(int j=0; j<size; j++){
            if(a[i] == b[j]){
                char t =b[j];
                b[j]   =b[i];
                b[i]   =t;
                break;
            } 
        }
    }
    a==b ? printf("YES\n"):printf("NO\n");
    return 0;
}