#include <iostream>
#include <set>

using namespace std;

int main() {
    int n, num;
    set<int> uniqueNumbers;

    for (int i = 0; i < 2; i++) { // Loop twice for two arrays
        cin >> n;
        while (n--) {
            cin >> num;
            uniqueNumbers.insert(num);
        }
    }

    for (int number : uniqueNumbers) cout << number << " ";
std::cout << "\n";
}