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: Wrong Answer)

using System;

namespace ConsoleApp_ITP1_8_B
{
    class Program
    {
        static void Main(string[] args)
        {
            double output = 0;

            for(; ; )
            {
                string input = Console.ReadLine();

                if (input == "0")
                    break;
                else
                {
                    foreach(var s in input)
                    {
                        output += Int32.Parse(s.ToString());
                    }
                    Console.WriteLine(output);
                }
            }
        }
    }
}