Problem:
Sum of Numbers

Write a program which reads an integer and prints sum of its digits.

Input

The input consists of multiple datasets. For each dataset, an integer x is given in a line. The number of digits in x does not exceed 1000.

The input ends with a line including single zero. Your program should not process for this terminal symbol.

Output

For each dataset, print the sum of digits in x.

Sample Input

123
55
1000
0

Sample Output

6
10
1

Solution in C# (judge verdict: Accepted)

using System;

class ITP1_8_B
{
  static void Main()
  {
    while(true)
    {
      char[] s = Console.ReadLine().ToCharArray();
      if (s[0].ToString() == "0" && s.Length == 1) break;
      int sum = 0;
      for (int i = 0; i < s.Length; i ++)
      {
        sum += int.Parse(s[i].ToString());
      }
      Console.WriteLine(sum);
    }
  }
}