#include <iostream>
using namespace std;

int n, i, step;

int main ()
{
  cout << "Countdown!\n";
  for (n=10; n>0; n--) {
    cout << n << "\n";
  }


  cout << "Reverse Countdown!\n";
  for (i=1; i<=10; i++) {
    cout << i << "\n";
  }


  cout << "Custom Countdown\n";
  cout << "Please define step: ";
  cin >> step;
  n = 10;
  while (n>0) {
    cout << n << "\n";
    n = n - step;
  }



}