#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N=1e6+5;
const int mod=1e9+7;
signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	freopen("XOAB.INP","r",stdin);
	freopen("XOAB.OUT","w",stdout);
	map<int,int>mp;
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		int x;
		cin>>x;
		if(mp[x]==0){
			cout<<x<<" ";
			mp[x]=1;
		}
	}
}