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 JAVA (judge verdict: Accepted)

import java.io.*;
import java.util.*;

class Main{
    public static void main(String[] args)throws IOException{

        InputStreamReader isr =new InputStreamReader(System.in);
   		BufferedReader br =new BufferedReader(isr);
    	String buf = br.readLine();
        
        while (true) {
            int i, sum = 0;
            if (buf.charAt(0) - '0' == 0) break;
            for (i = 0;i < buf.length();i++) {
                sum += buf.charAt(i)-'0';
            }
            System.out.println(sum);
            buf = br.readLine();
        }
    }
}