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)

x_array = []
loop do
  x = gets.chomp.chars.map(&:to_i)
  if x == [0]
    break
  else
    length= x.length
    x_sum = 0
    for i in 0..(length-1)
      x_sum += x[i]
    end
    x_array.push(x_sum)
  end
end
length = x_array.length
for i in 0..(length-1)
  puts x_array[i]
end