//SOL public static int Solve(int num) { string sNum = Math.Abs(num) + ""; int sign = num < 0 ? -1 : 1; num = Helfer.GetNumber(sNum[sNum.Length - 1]); for (int i = sNum.Length - 2; i >= 0; i--) { int tmp = num * 10 + Helfer.GetNumber(sNum[i]); if (tmp <= num) { return(0); } num = tmp; } return(num); }