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.Text;

class Program
{
    static void Main(string[] args)
    {
        while (true)
        {
            string input = Console.ReadLine();
            if (input == "0")
            {
                break;
            }
            int[] e = input.ToCharArray().Select(x => int.Parse(x.ToString())).ToArray();
            int a = 0;
            for (int i = 0; i < e.Length; i++)
            {
                a += e[i];
            }
            Console.WriteLine(a);
        }
    }
}