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)

while True:
    x = str(raw_input())
    if int(x) == 0:
        break
    sum = 0
    for i in range(len(x)):
        sum += int(x[i])
    print sum