#include <iostream>
#include <set>

int main() {
    int n = 4; // Size of the first array
    int array1[] = {8, 2, 6, 4}; // Elements of the first array
    int m = 5; // Size of the second array
    int array2[] = {9, 1, 5, 3, 7}; // Elements of the second array

    std::set<int> unionSet;

    // Insert elements of the first array into the set
    for (int i = 0; i < n; ++i) {
        unionSet.insert(array1[i]);
    }

    // Insert elements of the second array into the set
    for (int j = 0; j < m; ++j) {
        unionSet.insert(array2[j]);
    }

    // Output results
    for (const int& num : unionSet) {
        std::cout << num << " ";
    }
    std::cout << std::endl;

    return 0;
}