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: WA: Presentation Error)

goukei = []
sum = 0
count = 1

loop do

	number = gets.split("").map(&:to_i)

	for i in 0..number.size - 1
		sum += number[i]
	end

	if sum == 0 then 
		break
	else
 		goukei[count] = sum
 	end

 	count += 1

 	sum =0

end

puts goukei