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