// editor1
#include<stdio.h>
#include<stdlib.h>

typedef struct node{
    int data;
    struct node *next;
    struct node *prev;
}Node;

Node *head=NULL,*tail=NULL;
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{
        tail->next=newnode;
        newnode->prev=tail;
        tail=newnode;
    }
}

void display(){
    Node *itr;
    for(itr=head;itr != NULL; itr=itr->next){
        printf("%d",itr->data);
    }
}
int main(){
    int size,num,itr;
    scanf("%d",&size);
    for(itr = 1; itr<=size;itr++){
        scanf("%d",&num);
        create(num);
    }
    dispaly();
    return 0;
}