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 nums = gets
  nums.chomp!
  data = nums.split(//).map{|e|e.to_i}
  break if data.size == 1 && data[0] == 0
  puts data.inject(0){|memo,elem|memo += elem}
end

# inject(init){|memo,arrayElement|}
# inject's return value is last memo values