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;

namespace AizuOnlineJudge
{
    class Program
    {
        static void Main(string[] args)
        {
            string s;
            while((s = Console.ReadLine()) != "0")
            {
                Console.WriteLine(s.Select(c => c - '0').Sum());
            }
        }

        /*private static bool IsInput(out int[] arr)
        {
            var s = Console.ReadLine();
            if (s == "0 0") { arr = null; return false; }

            arr = s.Split(' ').Select(int.Parse).ToArray();
            return true;
        }
        // */
    }
}