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: Wrong Answer)

while
x = gets.to_i
if x == 0;break
end
    a = x / 1000
    x = x % 1000
    b = x / 100
    x = x % 100
    c = x / 10
    d = x % 10
    
    puts a + b + c + d
end