백준 JavaScript 입출력

const fs = require('fs');
const input = fs.readFileSync('input.txt').toString();
let start = 1;

const sum = (num) => {
    let sum = 0;
    while(num > 0) {
        sum += num % 10;
        num = Math.floor(num/10);
    }

    return sum;
}

while(true) {
    if ((start + sum(start)) == input) {
        console.log(start);
        break;
    }
    if (start == input) {
        console.log(0);
        break;
    }
    start++;
}

const fs = require('fs');
const input = fs.readFileSync('input.txt').toString().split('\n');
let answer = '';

for (let i = 1; i <= input[0]; i++) {
    let totalScore = 0;
    let score = 0;
    let str = input[i];
    
    for (let j = 0; j < str.length; j++) {
        if(str.charAt(j) == 'O') {
            totalScore += ++score;
        } else {
            score = 0;
        }
    }
    answer += totalScore + '\n';
}

console.log(answer);