#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->prev=NULL;
    newNode->next=NULL;
    if(head==NULL)
    {
        head=newNode;
        tail=newNode;
    }
    else
    {
        newNode->prev=tail;
        tail->next=newNode;
        tail=newNode;
    }
}
void display()
{
    for(int iter=head;iter!=NULL;iter=iter->next)
    {
        printf("%d",iter->data);
    }
}
int main()
{
    int size,i,num;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    for(i=1,i<size;i++)
    {
        scanf("%d",&num);
        create(num);
    }
    display();
    return 0;
}