#include <stdio.h>

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

typedef struct {
       int size;
       node * top;
       }stk;

void push_s(int  data, stk * ptr)
{
     node * added = (node *)malloc(sizeof(node));
     added->data = data;
     added->prev = ptr->top;
     ptr->top = added;
     ptr->size++;
}

int pop_s(stk * ptr)
{
    int s = (ptr->top)->data;
    node * temp = (ptr->top)->prev;
    free(ptr->top);
    ptr->top = temp;
    return s;
}

int main()
{
    stk sta;
    stk * ptr = &sta;
    push_s(15,ptr);
    push_s(12,ptr);
    push_s(44,ptr);
    push_s(92,ptr);
    push_s(10,ptr);
    
    int i;
    for(i = 0; i<5; i++)
    {
          printf("%d \n",pop_s(ptr));
    }
}