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 (false !== ($line = fgets(STDIN))) {
    $line = trim($line);
    if ('0' === $line) {
        break;
    }
    $nums = preg_split('//', trim($line), -1 , PREG_SPLIT_NO_EMPTY);

    $sum = array_reduce($nums, function ($carry, $item) { return $carry + intval($item); }, 0);
    echo "$sum\n";
}