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 A
{
	public static void Main ()
	{

		while (true) {
			char[] s = Console.ReadLine ().ToCharArray ();
			if (s[0] == '0') {
				break;
			}

			int sum = 0;
			for (int i=0; i<s.Length; i++) {
				sum += s [i] - 48;
			}
			Console.WriteLine (sum);
		}
	}
}