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)

def read_inputs
  numbers = []
  loop do
    x = gets.chomp
    case x
      when "0" then break
      else numbers << x
    end
  end
  numbers
end

numbers = read_inputs
puts numbers.map{|x| x.split("").map(&:to_i).inject(:+)}.join("\n")