using System;

module StringExt
{
  public Capitalize(this s : string) : string
  {
    Char.ToUpper(s[0]).ToString() + s.Substring(1)
  }
}

def beers(n) {
  | 0 => "no more bottles of beer"
  | 1 => "1 more bottle of beer"
  | _ => $"$n bottles of beer"
}

def onTheWall = n => $"$(beers(n)) on the wall, $(beers(n)).\n";