#include <stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX 100
typedef struct node{
    char data[MAX];
    struct node*prev;
    struct node*next;
}Node;
Node*head=NULL,*tail;
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 n,num;
    scanf("%d", &n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    char ch[20];
    for (int i=1;i<=n;i++){
        if(scanf("%s",ch)==1)
          create(ch);
    }
}
    display();
    return 0;
}
}