def eliminate_prefix(v, u):
    """
    Removes prefix b from the given input word v
    If v = uw (u=prefix, w=suffix),
    w = u-1 v
    Parameters:
    -----------------------------------
    v: str
        A (sub)word
    u: str
        The prefix to remove

    Returns:
    -----------------------------------
    w : str
        (sub)word with the prefix removed
    """

    w = v.lstrip(u)
    return(w)