#include<stdio.h>
#include<stdlib.h>
typedef struct node
{
    int data;
    struct node*prev;
    struct node*next;
}node;
node*head=NULL,*tail;
void create(int num)
{
    node*newnode(node*)malloc(sizeof(node));
    newnode->data=num;
    newnode->prev=NULL;
    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<=0,i++){
        scanf("%d",&num);
        create(num);
    }
    display();
    return 0;
}