#!/usr/bin/python3

"""Our own little animal farm."""

import sys

def add_animal(farm,animal):
  farm.add(animal)
  return farm
  
def main(animals):
  farm = set()
  for animal in animals:
    farm = add_animal(farm,animal)
  print("We've got some animals on the farm:", ", ".join(farm) + ".")
  

if __name__=='__main__':
  if len(sys.argv) == 1:
    print("Pass at least oneo animal type!")
    sys.exit(1)
  main(sys.argv[1:])
  
  
