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 AOJ1_8_B
{
    class Program
    {
        static void Main(string[] args)
        {
            while(true)
            {
                string STR = Console.ReadLine();
                double str = 0;
                if (STR == "0") break;
                else
                { 
                    for (long i = 0; i < STR.Length; i++)
                    {
                        str += double.Parse(STR.Substring(int.Parse(i.ToString()), 1));
                    }
                }
                Console.WriteLine(str);
            }
        }
    }
}