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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def cycle_find(key, width=4):
 """ Given an element of a de Bruijn sequence, find its index in that sequence. Args: key(str):
 The piece of the de Bruijn sequence to find. width(int):
 The width of each element in the sequence. Returns: int: The index of ``key`` in the de Bruijn sequence. """


    key_len = len(key)
    buf = ''

    it = deBruijn(width, 26)

    for i in range(key_len):
        buf += chr(ord('A') + next(it))

    if buf == key:
        return 0

    for i, c in enumerate(it):
        buf = buf[1:] + chr(ord('A') + c)
        if buf == key:
            return i + 1

    return -1