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 Ruby (judge verdict: Accepted)

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
def aux(s)
  s.split(//).map(&:to_i).sum
end

def main
  fh=STDIN
  #fh=File.new("x.txt", "r")
  while fh.gets
    s = $_.chomp
    break if s=="0"
    puts aux(s)
  end

end

if $0 == __FILE__ then
  main
end