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.Linq;
using System.Collections.Generic;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> sum = new List<int>();
            for (int i = 0; i > -1; i++)
            {
                string line = Console.ReadLine();
                if (int.Parse(line[0].ToString()) == 0)
                {
                    break;
                }
                else
                {
                    int number = 0;
                    for (int j = 0; j < line.Length; j++)
                    {
                        number += int.Parse(line[j].ToString());
                    }
                    sum.Add(number);
                }
            }

            foreach (int item in sum)
                Console.WriteLine(item);                    
        }

    }
}