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 PHP (judge verdict: Accepted)

<?php
	while (true) {
		$x = fgets(STDIN);
		if ($x == 0) break;

		$x = str_split($x);
		$sum = 0;
		foreach ($x as $num) {
			$sum += $num;
		}
		print "$sum\n";
	}