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;

namespace Sample101
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                var line = Console.ReadLine().ToCharArray();
                if (line.Length == 1 && line[0] == '0')
                {
                    return;
                }

                var result = 0;
                for (int i = 0; i < line.Length; i++)
                {
                    result += int.Parse(line[i].ToString());
                }

                Console.WriteLine(result);
            }
        }
    }
}