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)

while input = gets
    num = input.chomp.split("").map(&:to_i)
    
    sum = 0
    num.each do |x|
        sum += x
    end
    
    if sum != 0
        puts sum
    else
        exit
    end
end