#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    vector <int> MM;
    int N;
    cin >> N;
    int num[N];
    for(int i = 0;i < N;i++)
    {
        cin >> num[i];
        MM.push_back(num[i]);
    }
    sort(MM.begin(),MM.end());//
    auto last = unique(MM.begin(),MM.end());
    MM.erase(last, MM.end());
    for(int i:MM)
    {
        cout<<i<<endl;
    }
}