// editor1
import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int m=sc.nextInt();
        if(n<0 || m<0){
            System.out.println("Invalid input");
            return;
        }
        Set<Integer> s1=new LinkedHashSet<>();
        Set<Integer> s2=new LinkedHashSet<>();
        for(int i=0;i<n;i++){
            s1.add(sc.nextInt());
        }
        for(int i=0;i<m;i++){
            s2.add(sc.nextInt());
        }
        Set<Integer> union=new TreeHashSet<>(s1);
        union.addAll(s2);
        for(int u:union){
            System.out.print(u+" ");
        }
        System.out.println();
        Set<Integer> diff=new TreeHashSet<>(s1);
        diff.removeAll(s2);
        for(int u:diff){
            System.out.print(u+" ");
        }
        System.out.println();
        Set<Integer> Intersection=new TreeHashSet<>(s1);
        Intersection.retainAll(s2);
        for(int u:Intersection){
            System.out.print(u+" ");
        }
        System.out.println();
        
    }
}