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

}
for(itr=1;itr<=size;itr++)
{
    scanf("%d",&num);
    create(num);
}
display();
return 0;
}