Goat Latin LeetCode solution in Python

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class Solution:
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    def toGoatLatin(self, sentence: str) -> str:
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        wordList, result, index = sentence.split(" "), "", 1
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        for word in wordList:
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            if index > 1:
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                result += " "
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            firstLetter = word[0]
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            if firstLetter in "aeiouAEIOU":
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                result += word + "ma"
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            else:
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                result += word[1:] + firstLetter + "ma"
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            for i in range(index):
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                result += "a"
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            index += 1
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        return result