#include <bits/stdc++.h> using namespace std; int n; int a[20005]; int main() { cin >> n; for(int i = 0; i < n; ++i) cin >> a[i]; bool number[5005] = {false}; for(int i = 0; i < n; ++i) { if(number[a[i]] == false) { cout << a[i] << ' '; number[a[i]] = true; } } return 0; }