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 ITP1_8_B{
    static void Main(string[] args){
        while(true){
            int a = 0;
            string str = Console.ReadLine().Trim();
            char[] ch = str.ToCharArray();
            if(ch[0] == 48) break;
            foreach(char s in str){
                a += (int)s -48;
            }
            Console.WriteLine(a);
        }
    }
}