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;

class program
{
    public static void Main()
    {
        while (true)
        {
            char[] str = Console.ReadLine().ToCharArray();
            int sum = 0;

            if (str[0] == '0') break;

            for (int i = 0; i < str.Length; i++)
            {
                sum += int.Parse(str[i].ToString());
            }
            Console.WriteLine(sum);
        }
    }
}