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Solve the following problem using Python, implementing the functions described below, one line at a time
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<USER_TASK:>
Description:
 def hacking_import_alphabetical(logical_line, blank_before, previous_logical, indent_level, previous_indent_level):
 r"""Check for imports in alphabetical order. OpenStack HACKING guide recommendation for imports: imports in human alphabetical order Okay: import os\nimport sys\n\nimport nova\nfrom nova import test Okay: import os\nimport sys H306: import sys\nimport os Okay: import sys\n\n# foo\nimport six """

    # handle import x
    # use .lower since capitalization shouldn't dictate order
    if blank_before < 1 and indent_level == previous_indent_level:
        split_line = core.import_normalize(logical_line.
                                           strip()).lower().split()
        split_previous = core.import_normalize(previous_logical.
                                               strip()).lower().split()
        length = [2, 4]
        if (len(split_line) in length and len(split_previous) in length and
                split_line[0] == "import" and split_previous[0] == "import"):
            if split_line[1] < split_previous[1]:
                yield (0, "H306: imports not in alphabetical order (%s, %s)"
                       % (split_previous[1], split_line[1]))