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: WA: Presentation Error)

<?php
$display = array();
while (true) {
  $received_num = str_split(trim(fgets(STDIN)));
  if ($received_num[0] == 0) {
    break;
  }
  $sum = array_sum($received_num);
  array_push($display, $sum);
}
echo implode("\n", $display);