#include <stdio.h>
#include <stdlib.h>
#define OUTSTACK 2147483647
#define STACKSIZE 100

int *top, *bottom, *max_stack;

int push( int item )
{
  if (top < max_stac)
    return *top++ = item;
  else
  {
    printf(”Pinon ylivuoto\n”);
    return OUSTACK;
  }
}

int pop( void )
{
  if (top > bottom)
    return *--top;
  else
  {
    printf(”Pinon alivuoto\n”);
    return OUTSTACK;
  }
}

int main(void)
{
  int luku, ok;

  bottom = top = (int *) malloc(STACKSIZE*sizeof(int));
  max_stack = bottom + STACKSIZE;

  while ( scanf(”%d”,&luku)==1 )
  {
    ok = push(luku);
    if ( ok==OUTSTACK ) break;
  }

  while (top > bottom)
  printf(”%d \n”, pop());

  return 0;
}