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)

a = Array.new
i = 0
loop do
	b = gets.to_i
	break if b == 0
	a[i] = b.to_s.split("").map(&:to_i)
	i += 1
end
for j in 0..i-1
	puts a[j].inject(:+)
end