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)

import sys

for line in sys.stdin:
    if int(line) == 0: break
    s = 0
    for c in line.strip('\n'):
        s += '0123456789'.index(c)
    print s