#include <iostream>
#include <set>
//#include <stdlib.h>

using namespace std;

int main()
{
    //srand((unsigned int)time(nullptr));
    int n;
    while(cin>>n)
    {
        set<int>s;
        for(int i = 0;i<n;i++)
        {
            int temp;
            cin>>temp;
            //int temp = rand()%1000+1;
            s.insert(temp);
        }
        for(auto x:s)
        {
            cout<<x<<endl;
        }
    }
    return 0;
}