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 Python (judge verdict: Accepted)

#!/usr/bin/env python

if __name__ == '__main__':
    while True:
        s = raw_input()
        if s == '0':
            break
        print sum(map(int, list(s)))