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)

//????????????????±???????(123???6???1000???1)
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
	public static void main(String[] args) throws IOException{
		StringBuilder sb = new StringBuilder();
		BufferedReader br =
				new BufferedReader(new InputStreamReader(System.in));
		
		//0?????\?????????????????§??°?????????
		while(true) {
			int sum = 0;								//???????????°??????????¨????sum
			String str = br.readLine();					//??????????????????????????\??????str
			long num = Long.parseLong(str);
			
			if(str.equals("0")) {						//0?????\?????????????????°????????????????????????
				break;
			}
			
			while(num>0) {
				sum += num%10;
				num /= 10;
			}
			sb.append(sum + "\n");
		}
		System.out.print(sb.toString());
	}

}