#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;
    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 size,num,i;
    scanf("%d",&size);
    if(num<0){
            printf("Invalid input");
            return 0;
        }
        for(i=0;i<size;i++){
            scanf("%d",&num);
            return 0;
        }
        create(num);
}
display();
return 0;