#include "char_stack.h"
#include <stdio.h>

cstack::cstack(int capacity) : gstack(capacity)
{
  
}

char cstack::push(char value)
{
  char *c = new char;
  *c = value;
  vpush((void *)c);
  return *c;
}

char cstack::pop()
{
  char c1, *c = (char *)vpop();
  c1 = *c;
  delete c;
  return c1;
}


int main()
{
    char myChar;
    cstack s1(100);

    while ((scanf("%c", &myChar)) != EOF) {
	s1.push(myChar);
    }

    while (!s1.empty()) {
	printf("%c\n", s1.pop());
    }

    return 0;
}