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)

i = gets.chomp.to_s
len = i.length

until i == "0"
	arr = i.split("")
	sum = 0
	for k in 0..len - 1
		sum += arr[k].to_i
	end
	
	puts sum
	
	i = gets.chomp.to_s
	len = i.length
end