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