#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *next;
}Node;

Node * head = NULL *tail;

void create (int num){
    newnode=(Node*) malloc (sizeof(node)));
    newnode ->data = num;
    newnode ->next = NULL;
    if(head == NULL){
        head = newnode;
        tail = newnode;
    }
    else
    {
        tail ->next = newnode;
        tail = newnode;
    }
}