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 true
  ans = 0
a = gets.chomp
b = a.split("").map(&:to_i)
c = b.length
break if a == "0"
  for num in 0..c-1 do
      ans += b[num]
  end
  p ans
end