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    You are almost there! Modify your code to become case insensitive.
    For e.g. for AAaab -> the count should be 1, not 2
    (since A and a are the same alphabet, but case is different).

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    You need to handle uppercase vs lowercase.
    For e.g. for AAaab -> the count should be 1, not 2
    (since A and a are the same alphabet, but case is different).

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