'''
Your function should take in a single parameter (a string `word`)
Your function should return a count of how many occurences of ***"th"*** occur within `word`. Case matters.
Your function must utilize recursion. It cannot contain any loops.
'''

def count_th(word, count = 0):

    occurrence = word.find('th')

    if occurrence == -1:
        return count

    if word[occurrence: occurrence + 2] != 'th':
        count_th(word[occurrence + 2 : ]) 

    else:
        count += 1

    return count_th(word[occurrence + 2 : ], count)



