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.Text;

public class Test
{
	static public void Main( )
	{
		StringBuilder output = new StringBuilder();
		string strs;
		while( "0" != (strs = Console.ReadLine()) ) {
			int sum = 0;
			for( var i=0; i<strs.Length; i++ ) {
				sum += int.Parse( strs[i].ToString() );
			}
			output.AppendLine( sum.ToString() );
		}
		Console.Write( output );
	}
}