// editor2
#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(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,i;
    scanf("%d",&size);
    if(size < 0){
        printf("Invalid input");
        return 0;
    }
    for(i=0; i<n; i++){
        scanf("%d",&num);
        create(num);
    }
    display();
    return 0;
}