#include<stdio.h>
#include<stdlib.h>
#include<string.h>

typedef struct node
{
    char data[20];
    struct node *prev,*next;
}Node;

Node *head=NULL,*tail=NULL;
void create(char *ch)
{
    Node *newNode=(Node*)malloc(sizeof(Node));
    strcpy(newNode->data,ch);
    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=tail;
    for(;itr!=head;itr=itr->prev;)
    {
        printf("%s",itr->data);
    }
    printf("%s",itr->data);
}

int main()
{
    int size,itr;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    char ch[20];
    for(itr=1;itr<=size;itr++)
    {
        if(scanf("%s",ch)!=1)
        {
            break;
        }
    create(ch)
    }
    display();
    return 0;
}