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- let sum = 0;
- let digits = gets();
- for (let i = 0; i < digits.length; i++) {
- if (isNaN(digits[i])) {
- continue;
- }
- sum += Number(digits[i]);
- }
- while (sum > 9) {
- digits = sum.toString();
- sum = 0;
- for (let i = 0; i < digits.length; i++) {
- sum += Number(digits[i]);
- }
- }
- print(sum);
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