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;
class Program
{
    static void Main()
    {
        bool flag = true;
        List<string> x = new List<string>();

        while (flag)
        {
            string s = Console.ReadLine();
            if (s == "0")
                flag = false;
            else
                x.Add(s);
        }

        for (int i = 0; i < x.Count; i++) 
        {
            int sum = 0;
            string number = x[i];
            char[] digits = new char[number.Length];
            for (int j = 0; j < number.Length; j++)
            {
                digits[j] = number[j];
            }
            for (int j = 0; j < digits.Length; j++)
            {
                sum += (int)digits[j] - 48;
            }
            Console.WriteLine(sum);
        }

    }
}