#include <bits/stdc++.h>
using namespace std;
const int maxn = 20000 + 10;
int a[maxn], b[maxn];
int main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    bool visited[5001] = {false};
    int cnt = 0;
    for (int i = 0; i < n; i++) {
        if (!visited[a[i]]) {
            visited[a[i]] = true;
            b[cnt++] = a[i];
        }
    }
    for (int i = 0; i < cnt; i++) {
        cout << b[i] << " ";
    }
    cout << endl;
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
const int maxn = 20000 + 10;
int a[maxn], b[maxn];
int main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    bool visited[5001] = {false};
    int cnt = 0;
    for (int i = 0; i < n; i++) {
        if (!visited[a[i]]) {
            visited[a[i]] = true;
            b[cnt++] = a[i];
        }
    }
    for (int i = 0; i < cnt; i++) {
        cout << b[i] << " ";
    }
    cout << endl;
    return 0;
}