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def wave(txt: str) -> list:

"""

Returns a so called 'wave' of a given string

>>> wave('cat')

['Cat', 'cAt', 'caT']

>>> wave('one')

['One', 'oNe', 'onE']

>>> wave('book')

['Book', 'bOok', 'boOk', 'booK']

"""

return [

txt[:a] + txt[a].upper() + txt[a + 1 :]

for a in range(len(txt))

if txt[a].isalpha()

]

if __name__ == "__main__":

__import__("doctest").testmod()