#include<bits/stdc++.h>
using namespace std;
int a[1005],b[1005],c[1005];
int main(){
	int n,m;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		c[a[i]]++;
	}
	cin>>m;
	for(int i=1;i<=m;i++){
		cin>>b[i];
		c[b[i]]++;
	}
	for(int i=1;i<=1000;i++){
		if(c[i]>1) cout<<i<<" ";
	}
	cout<<endl;
	for(int i=1;i<=1000;i++){
		if(c[i]) cout<<i<<" ";
	}
	cout<<endl;
	for(int i=1;i<=1000;i++){
		if(c[i]==1){
			for(int j=1;j<=n;j++){
         		if(a[j]==i) cout<<i<<" ";
      		}
		}
   }
}
/**************************************************************
	Problem: 1852
	User: wangyiyang
	Language: C++
	Result: Runtime Error
****************************************************************/