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class Solution:
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    def reversePrefix(self, word: str, ch: str) -> str:
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        """
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        #method 1:
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        for i in range(len(word)):
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            if word[i]==ch:
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                return word[:i+1][::-1]+word[i+1:]
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        return word"""
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        # method 2:
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        l = 0
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        r = word.find(ch)
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        word = list(word)
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        while l < r:
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            word[l], word[r] = word[r], word[l]
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            l += 1
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            r -= 1
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        return "".join(word)