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:
    a=input()
    if a==0:
        break
    b=0
    for i in range(len(str(a))):
        b+=a%10
        a=a/10
    print b