#include<stdio.h>
#include<stdlib.h>
typedef struct data{
int a;
struct data *next;}data;
data *head=NULL;
int top(int )
{
    return head->a;
}
void push(int n)
{
    data *new_node=(data*)malloc(sizeof(data));
    new_node->a=x;
    new_node->next=NULL;
    if(head==NULL)
    {
        head=new_node;
        return;
    }
     new_node->next=head;
     head=new_node;

}
int pop(0)
{
    int x;

    data *temp=head;
    if(head==NULL)
    {
     printf("Empty\n");
     return -1;
    }
    data *del=head;
    head=head->next;
    x=del->a;
    free(del);
    return x;

}
int main()
{
     push(6);
     push(7);
     push(9);
     printf("%d\n",pop());
     printf("%d\n",top());
}