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;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        string str;

        var result = new List<int>();       
        int sum = 0;
        
       while (true)
        {
            str = Console.ReadLine();

            if (str == "0")
            {
                break;
            }

            char[] num = str.ToCharArray();          

            for (int i = 0; i < num.Length; i++)
            {
                sum += int.Parse(num[i].ToString());
            }
            result.Add(sum);
            sum = 0;
        }

        foreach (var v in result)
        {
            Console.WriteLine(v);
        }

    }
}