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

if __FILE__ == $0 then
	loop do
		s = gets.chomp
		if s == '0' then
			break
		end
		puts s.split('').map(&:to_i).sum
	end
end