#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 data){
     struct Node*newNode=(struct Node*)malloc(sizeof(struct Node));
     newNode->data=data;
     newNode->next=NULL;
     newnode->prev=NULL;
     if(head==NULL){
         head=newnode;
         tail=newnode;
         }
    else{
        newnode->prev=tail;
        tail->next=newnode;
        tail=newnode;
        tail->next=head;
        tail->prev=tail;
    }
 }
 void insert(int val){
     Node *newnode=(Node*)malloc(1*sizeof(Node));
     newnode->data=val;
     tail->next=newnode;
     newnode->next=head;
     newnode->prev=tail;
     head->prev=newnode;
     tail=newnode;
     
     Node *i=tail;
     do{
         printf("%d ",i->data);
         i=i->prev;
         }while(i!=tail);
 }
 int main(){
     int size,val,iter,num;
     if(scanf("%d",&size)!=1||size<0){
         printf("Invalid input";
         return 0;
     }
     for(iter=0;iter<size;iter++){
         scanf("%d",&num);
         create(num);
     }
     scanf("%d",&val);
 }