Hackerrank Minion Game problem

minion_game.py

"""
Submit this code at: https://www.hackerrank.com/challenges/the-minion-game
"""

def match(text, pattern):
	"""
	>>> match('banana', 'ana')
	2
	"""
	return sum([1 for i in range(len(text)) if text[i:i+len(pattern)] == pattern])

def substrings(word):
	"""
	>>> substrings('hello')
	['h', 'he', 'hel', 'hell', 'hello']
	"""
	return [word[:i+1] for i in reversed(range(len(word)))]
	
def all_substrings(word):
	"""
	>>> all_substrings('hel')
	[['h', 'he', 'hel'], ['e', 'el'], ['l']]
	"""
	all_subs = []
	for i in range(len(word)):
		all_subs += substrings(word[i:])
	return set(all_subs)
	
def minion(word):
	stuart = 0
	kevin = 0
	consonants = 'bcdfghjklmnpqrstvwxyz' + 'bcdfghjklmnpqrstvwxyz'.upper()
	vowels = 'aeiou' + 'aeiou'.upper()
	
	for string in all_substrings(word):
		if string[0] in consonants:
			stuart += match(word, string)
				
		elif string[0] in vowels:
			kevin += match(word, string)
	
	if stuart > kevin:
		return 'Stuart {}'.format(stuart)
	elif stuart < kevin:
		return 'Kevin {}'.format(kevin)
	else:
		return 'Draw'

print(minion(input()))