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Oct 17th, 2019
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  1. function solve(input) {
  2.  
  3.     let N = Math.abs(input.shift()).toString().replace('.', '');
  4.     let sum = 0;
  5.  
  6.     do {
  7.         for (let i = 0; i <= N.length - 1; i++) {
  8.             sum += Number(N[i]);
  9.         }
  10.         if (sum <= 9) {
  11.             console.log(sum);
  12.             break;
  13.         }
  14.         N = Number(N);
  15.         N = sum;
  16.         sum = 0;
  17.         N = N.toString()
  18.     } while (N.length > 1);
  19. }
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