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

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class Solution {
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  public boolean isSumEqual(String firstWord, String secondWord, String targetWord) {
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    int sumfirst = 0, sumsecond = 0, sumtarget = 0;
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    for (char c : firstWord.toCharArray()) {
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      sumfirst += c - 'a';
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      sumfirst *= 10;
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    }
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    for (char c : secondWord.toCharArray()) {
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      sumsecond += c - 'a';
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      sumsecond *= 10;
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    }
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    for (char c : targetWord.toCharArray()) {
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      sumtarget += c - 'a';
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      sumtarget *= 10;
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    }
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    return (sumfirst + sumsecond) == sumtarget;
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  }
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}