#include<stdio.h>
#include<stdli.h>
typedef struct node{
    int data;
    struct node *next;
    struct node *prev;
}node;
node *head=NULL,*tail,*i;
void create(int num){
    node *newnode=(node*)malloc(sizeof(1*node));
    newnode->data=num;
    newnode->next=NULL;
    if(head==NULL){
        head=newnode;
        tail=newnode;
    }
    else{
        newnode->prev=tail;
        tail->next=newnode;
        tail=newnode;
    }
}
void display(){
    node *itr;
    for(itr=head;itr!=head;itr=itr->next){
        printf("%d",itr->data);
    }
}
int main(){
    int size,i,n,val;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid input");
    }
    for(i=0;i<=size;i++){
        scanf("%d",&n);
        create(num);
    }
    display();
    return 0;
}