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