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

class Main{
  public static void main(String[] args) throws java.lang.NumberFormatException{
    Scanner scan=new Scanner(System.in);

    while(true){
      long num=Long.parseLong(scan.next());
      if(num==0)break;

      String buf=String.valueOf(num);
      long sum=0;

      for(int i=0;i<buf.length();i++){
        sum+=Character.getNumericValue(buf.charAt(i));
      }
      System.out.println(sum);
    }
  }
}