#include<bits/stdc++.h>
using namespace std;
int sum[100010];
int main(){
	freopen("merge.in","r",stdin);
	freopen("merge.out","w",stdout);
	int a,b;
	cin >> a >> b;
    for(int i = 0;i < a + b;i ++){
    	cin >> sum[i];
	}
	sort(sum ,sum + a + b);
	int hui = 123456789;
	for(int i = 0;i < a + b;i ++){
		if(hui == sum[i]) {
			continue;
		}
		cout << sum[i] << ' ';
		hui = sum[i];
	}
	return 0;
}