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 a = (gets.to_i) do
    break if a == 0
    sum = 0
    b = Array.new(1000,0)
    1000.times do |i|
        b[i] = a%10
        a /= 10
        sum += b[i]
    end
    puts sum
end