#include<stdlib.h>
#include<stdlib.h>
int display();
int create(int num);
typedef struct node{
    int data;
    struct node *next;
    struct node *prev
}node;

node *tail,*head,*newnode;

int main()
{
    int size,num,i;
    if(!(scanf("%d",&size))||size<=0)
    {
        printf("Invalid input");
        return 0;
    }
    for(i=0;i<size;i++)
    {
        if(!(scanf("%d",&num)))
        {
            printf("Invalid input")
            return 0;
        }
        create(num);
    }
    display();
}
int create(int num)
{
    newnode=(node*)malloc(sizeof(node));
    newnode->next=NULL;
    newnode->data=num;
    newnode->prev=NULL;
}
if (head == NULL)
{
    head=newnode;
    tail=newnode;
}
else
{
    newnode->prev=tail;
    tail->next=newnode;
    tail->newnode;
}
}
int display()
{
    node *temp;
    for(temp=head;temp!=NULL;temp=temp->next)
    {
        printf("%d ",temp->data);
    }
}