#include <bits/stdc++.h>
 
using namespace std;
 
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
 
    int n;
    cin >> n;
    cin.ignore();
 
    string str;
    getline(cin, str);
 
    bool check[10] = {false,};
 
    for (char c : str) {
        if (isdigit(c)) {
            check[c - '0'] = true;
        }
    }
 
    for (int i = 0; i <= 9; i++) {
        if (check[i]) {
            cout << i << "\n";
        }
    }
 
    return 0;
}

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MTAKMyAxIDQgMSA1IDkgMiA2IDUgMw==

10
3 1 4 1 5 9 2 6 5 3