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)


loop do
    a = gets.chomp
    
    if a.eql?("0") then
        break
    end
    
    c = 0
    a.each_char do |i|
        c += i.to_i
    end
    print c, "\n"
end