#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node*next;
    struct node*prev;
    
}Node;
Node *head=NULL,*tail,*iter;
void create(int num){
    Node *newnode=(Node*)malloc(1*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*iter;
    for(iter=head;iter!=NULL;iter=iter->next){
        printf("%d ",&num);
    }
}
int main(){
    int size,itr,num;
    scanf("%d\n",&num);
    if(num<0){
        printf("Invalid input");
        }
        for(itr=0;itr<size;itr++){
            scanf("%d",&num);
            create(num);
        }
        if(num<0){
            printf("Invalid input");
        }
        display();
        return 0;
}