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;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {

            var a = true;


            var list = new List<int>();

            while (a)
            {

                var input = Console.ReadLine();

                if (input == "0")
                {
                    a = false;
                }
                else
                {

                    var ans = numbersum(input);

                    list.Add(ans);
                }

            }
            list.ForEach(x => Console.WriteLine(x));
            Console.ReadLine();
        }
        static int numbersum(string number)
        {
            var rnum = number.Select(x => int.Parse(x.ToString())).Sum();
            return rnum;

        }


    }
}