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) {
    $stdin = preg_split('//', trim(fgets(STDIN)));

    if ($stdin[1] == 0) return;

    print(array_sum($stdin) . "\n");
}