#include<stdio.h>
#include<stdlib.h>

typedef struct node {
    int data;
    struct node *next;
}node;

Node *head = NULL, *tail

void create(int num){
    Node *nodeNode;
    newNode = (Node*) malloc (1 *sizeof(Node));
    newNode->data = num;
    newNode->next = NULL;
    if(head == NULL) {
        head = newNode;
        tail = nweNode;
    }
    else {
        tail->next = newNode;
        tail =newNode;
    }
}

void display() {
    Node *itr;
    for(itr=head;itr!=NULL;itr=itr->next)
}

int main() {
    int size,itr,num;
    scanf("%d",&size);
    if(size<0) {
        printf("Invalid input");
        return 0;
    }
    create(num);
}
display();
return 0;
}