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