#include <iostream>
#include <vector>
//#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 7;
const int INF = 2e9;

int main() {
    int n;
    cin >> n;

    string s;
    cin >> s;

    for(int bitmask = 0; bitmask < (1 << n); bitmask++) {
        string tmp = "";

        for(int i = 0; i < n; i++) {
            if(bitmask & (1 << i)) {
                tmp += s[i];
            }
        }
        cout << tmp << endl;
    }
    return 0;
}