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: Time Limit Exceeded)

loop {
  x = gets.to_s

  if x == '0'
    break
  else
    sum = 0
    x.chars { |i| sum += i.to_i }
    puts sum
  end
}