#include<stdio.h>
#include<stdlib.h>

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