Cells in a Range on an Excel Sheet LeetCode solution in Python

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# Runtime: 52 ms (Top 33.3%) | Memory: 16.43 MB (Top 7.2%)
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class Solution:
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    def cellsInRange(self, s: str) -> List[str]:
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        start, end = s.split(":")
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        start_letter, start_num = start[0], int(start[-1])
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        end_letter, end_num = end[0], int(end[1])
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        alphabet = list("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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        alphabet_slice = alphabet[
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            alphabet.index(start_letter) : alphabet.index(end_letter) + 1
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        ]
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        res = list()
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        for el in alphabet_slice:
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            res += [el + str(num) for num in range(start_num, end_num + 1)]
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        return res