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
x = gets.to_i
if x == 0;break
end
i = 10 ** 1000
n = 0
a = []
while 1 <= i do
    a[n] = x / i
    x = x % i
    i /= 10
    n += 1
end
puts a.sum
end