count-words.py

def count(message):
    words = 0
    last = ' '
    for letter in message:
        if not letter.isalpha() and (last == 'r' or last == 's'):
            words = words + 1
        last = letter

    if last == 'x' or last == 's':
        words = words + 1

    return words



def test_multiple_matching_words() :
  assert count("cats|dogs") == 2

def test_last_doesnt_match() :
  assert count("cats|dog") == 1