#include <iostream>
#include <set>

using namespace std;

int main(){

    int num = 0,tmp = 0;

    while (cin>>num) {
        set<int> numbers;
        while (num --) {
            cin>>tmp;
            numbers.insert(tmp);
        }
        for(const int& i:numbers){
            cout<<i<<endl;
        }

    }
    return 0;
}

set默认排序