#include <library.h>

string small[] = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight",
   "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen",
   "seventeen", "eighteen", "nineteen" };

string ty[] = { "zero", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy",
   "eighty", "ninety" };

void say_number(const int N)
{ if (N < 0)
  { print("minus ");
    say_number(- N); }
  else if (N < 20)
    print(small[N]);
  else if (N < 100)
  { const int first = N / 10;
    const int second = N % 10;
    print(ty[first]);
    if (second != 0)
    { print("-");
      say_number(second); } }
  else if (N < 1000)
  { const int first = N / 100;
    const int second = N % 100;
    say_number(first);
    print(" hundred");
    if (second != 0)
    { print(" and ");
      say_number(second); } }
  else if (N < 1000000)
  { const int first = N / 1000;
    const int second = N % 1000;
    say_number(first);
    print(" thousand");
    if (second != 0)
    { if (second < 100)
        print(" and ");
      else
        print(" ");
      say_number(second); } }
  else if (N < 1000000000)
  { const int first = N / 1000000;
    const int second = N % 1000000;
    say_number(first);
    print(" million");
    if (second != 0)
    { if (second < 100)
        print(" and ");
      else
        print(" ");
      say_number(second); } }
  else
  { const int first = N / 1000000000;
    const int second = N % 1000000000;
    say_number(first);
    print(" billion");
    if (second != 0)
    { if (second < 100)
        print(" and ");
      else
        print(" ");
      say_number(second); } } }

int main()
{ print("Type a number: ");
  const int number = read_int();
  say_number(number);
  new_line(); }