Apply Discount to Prices LeetCode solution in Python

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class Solution:
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    def discountPrices(self, sentence: str, discount: int) -> str:
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        s = sentence.split()  # convert to List to easily update
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        m = discount / 100
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        for i, word in enumerate(s):
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            if (
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                word[0] == "$" and word[1:].isdigit()
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            ):  # Check whether it is in correct format
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                num = int(word[1:]) * (1 - m)  # discounted price
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                w = "$" + "{:.2f}".format(num)  # correctly format
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                s[i] = w  # Change inside the list
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        return " ".join(s)  # Combine the updated list