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.util.Scanner;

class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		String n=sc.next();
		while(!n.equals("0")){
			System.out.println(sum(n));
			n=sc.next();
		}
	}
	
	private static int sum(String s){
		int r=0;
		if(s.length()==1){
			r=Integer.parseInt(s);
		}else{
			r=Integer.parseInt(s.substring(0,1))+sum(s.substring(1));
		}
		return r;
	}
}