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: Wrong Answer)

loop do
  n = gets.split
  if n[0] == '0'
    break
  end
  j = 0
  for i in 1..n.length
    j += n[i-1].to_i
  end
  print j, "\n"
end