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;

namespace ITP1_8_B
{
	class Program
	{
		static void Main(string[] args)
		{
			List<string> vs = new List<string>();

			// 入力
			while(true) {
				string buf = Console.ReadLine();
				if(buf == "0") {
					break;
				}

				vs.Add(buf);
			}

			// 計算
			List<int> sums = new List<int>();

			foreach(string v in vs) {
				char[] cs = v.ToCharArray();
				int sum = 0;
				for(int i = 0; i < cs.Length; i++) {
					sum += int.Parse(cs[i].ToString());
				}

				sums.Add(sum);
			}

			// 出力
			foreach(int sum in sums) {
				Console.WriteLine(sum);
			}
		}
	}
}