#include<stdio.h>
int main()
{
   int n;
   if (n>0){
   printf("Invalid input");
   struct Node*=NULL;
   structNode*head = NULL;
   struct Node* head = malloc(sizeof(structNode));
   head->data =10;
   head->next = malloc(sizeof(structNode));
   head->next->data = 20;
   head->next->next = NULL;
   printf("d%" , head->next->data);
   return 0;