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;
using System.Text.RegularExpressions;

namespace CsProgramSpace
{
    class Program
    {
        static void Main(string[] args)
        {
            string temp = "";
            List<long> li = new List<long>();
            long sum = 0;
            while (true)
            {
                temp = Console.ReadLine();
                if (temp == "0") break;
                for(int i =0; i<temp.Length;i++)
                {
                    sum += int.Parse(temp.Substring(i, 1));
                }
                li.Add(sum);
                sum = 0;
            }
            foreach (long l in li) Console.WriteLine(l);
        }
    }
}