1880

class Solution {
public:
    bool isSumEqual(string firstWord, string secondWord, string targetWord) {
        string a, b, c;
        for(char ch: firstWord)
            a += ch-'a'+'0';
        for(char ch: secondWord)
            b += ch-'a'+'0';
        for(char ch: targetWord)
            c += ch-'a'+'0';
        return (stoi(a)+stoi(b) == stoi(c));
    }
};