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: Runtime Error)

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(true){
            int x = sc.nextInt();

            if(x==0){
                break;
            }

            int answer=0;
            while(true){
                if(x==0){
                    break;
                }
                answer += x % 10;
                x = x / 10;
            }
            System.out.printf("%d\n",answer);
        }
    }
}