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export default function getLucky(s: string, k: number): number {    let nums = Array.prototype.map        .call(s, (c) => c.charCodeAt(0) - "a".charCodeAt(0) + 1)        .join("")        .split("")        .map(Number) as number[];    while (k) {        nums = nums            .reduce((a, v) => a + v)            .toString()            .split("")            .map(Number);        k--;    }    return Number(nums.join(""));}