#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=NULL;
     newNode->next=NULL;
     newNode->prev=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);
     }
 }
 int main()
 {
     int n,i,num;
     scanf("%d",&n);
     if(n<0)
     {
         printf("Invalid input");
         return 0;
     }
     for(i=0;i<=n;i++)
     {
         scanf("%d",&num);
         create(num);
     }
     display();
 }