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 Python3 (judge verdict: Accepted)

def plus_num(n):
    total = 0
    while n>0:
        total += n % 10
        n //= 10
    return total 

    
while True:
    a = int(input())
    if a == 0:
        break
    else:
        print(plus_num(a))