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 (($line = trim(fgets(STDIN))) !== '') {
    if ($line === '0') {
        break;
    }

    $arr = str_split($line);
    echo array_sum($arr), PHP_EOL;
}