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