#include<stdio.h>
#include<stdlib.h>
typedef struct link
{
	int num;
	struct link *n;
}node;
void main()
{
	node *head,*star,*temp,*p;
	int i,j,k;
	head=(node *)malloc(sizeof(node));
	star=(node *)malloc(sizeof(node));
	scanf("%d",&k);
	scanf("%d",&head->num);
	scanf("%d",&star->num);
	head->n=star;
	star->n=NULL;
	for(i=0;i<k-2;i++)
	{
		temp=(node *)malloc(sizeof(node));
		scanf("%d",&temp->num);
		temp->n=NULL;
		star->n=temp;
		star=temp;
	}
	p=head;
	while(p!=NULL)
	{
		printf("%d ",p->num);
		p=p->n;
	}
	printf("\n");
	i=0;
	while(head!=NULL)
	{	
		if(i%2!=0)
		printf("%d ",head->num);
		head=head->n;
		i++;
	}
}