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
$input = trim(fgets(STDIN));
while( 0 != $input ) {
    
    $list = str_split($input);
    $sum = 0;
    
    foreach ($list as $i) {
        $sum += (int)$i;
    }
    
    echo $sum . "\n";
    $input = trim(fgets(STDIN));
}