Check if Word Equals Summation of Two Words LeetCode solution in Python

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# Runtime: 40 ms (Top 58.1%) | Memory: 16.21 MB (Top 73.9%)
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class Solution:
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    def isSumEqual(self, firstWord: str, secondWord: str, targetWord: str) -> bool:
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        x = [
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            "a",
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            "b",
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            "c",
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            "d",
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            "e",
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            "f",
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            "g",
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            "h",
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            "i",
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            "j",
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            "k",
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            "l",
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            "m",
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            "n",
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            "o",
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            "p",
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            "q",
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            "r",
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            "s",
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            "t",
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            "u",
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            "v",
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            "w",
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            "x",
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            "y",
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            "z",
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        ]
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        a = ""
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        for i in firstWord:
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            a = a + str(x.index(i))
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        b = ""
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        for i in secondWord:
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            b = b + str(x.index(i))
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        c = ""
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        for i in targetWord:
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            c = c + str(x.index(i))
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        if int(a) + int(b) == int(c):
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            return True
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        return False