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#include<bits/stdc++.h>
#include<list>
using namespace std;
int main(){
	list<int> a;
	list<int> b;
	int i;
	cin>>i;
	while(i!=-1){
		a.push_back(i);
		cin>>i;
	}
	cin>>i;
	while(i!=-1){
		b.push_back(i);
		cin>>i;
	}
	int s=b.size();
	for(int i=0;i<s;i++){
		a.push_back(b.front());
		b.pop_front();
	}
	a.sort();
	for(auto it:a){
		cout<<it<<" ";
	}
	return 0;
}