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.IO;
using System.Linq;
using System.Text;

namespace _20170409_AOJ
{
    class Program
    {
        static void Main(string[] args)
        {
            for (;;)
            {
                char[] x = Console.ReadLine().ToCharArray();
                if (x.Length == 1 && x[0] == '0')
                {
                    break;
                }

                int sum = 0;
                foreach (var v in x)
                {
                    sum += v - '0';
                }

                Console.WriteLine(sum);
            }

            Console.ReadLine();
        }
    }
}