#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(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 size,itr,num;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    else{
        for(itr=1;itr<=size;itr++)
        {
            if(!scanf("%d",&size));
            {
                printf("Invalid input");
            
            }
            create(num);
        }
    }
    display();
    return 0;
}