#include<stdio.h>
#include<stdlib.h>
typedef struct list
{
    int data;
    struct node*next;
    struct node*prev;
}node;
node *head=NULL,*tail=NULL;
void create(int num)
{
    node *newnode=(node*)malloc(1*sizeof(node));
    newnode->data=num;
    nd->next=NULL;
    if(head==NULL)
    {
    head=tail=newnode;
    }
    else
    {
        newNode->prev=tail;
        tail->next=newnode;
        tail=newnode;
    }
}
void display()
{
    node*i;
    for(i=head;i!=NULL;i=i->next)
    {
        printf("%d",i->data);
    }
    printf("\n");
    for(i=head->next;i!=NULL;i=i->next)
    {
        printf("%d",i->data);
    }
}
int main()
{
    int n,num;
    scanf("%d",&n);
    if(n<0)
    {
        printf("Invalid input");
        return 0;
    }
    for(int i=0;i<0;i++)
        {
            if(scanf("%d",&num)!=1)
            {
                printf("Invalid input");
                return 0;
            }
            create(num);
        }
        display();

}