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(1){
	$N=trim(fgets(STDIN));
	if($N=='0') break;
	$s=0;
	foreach(str_split($N) as $n) $s+=(int)$n;
	echo $s,PHP_EOL;
}