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 dig_sum(n):
    sum = 0
    while n>0:
        sum += n%10
        n //= 10
    return sum

import sys
x = []
for l in sys.stdin:
    x.append(int(l))
    if int(l) == 0: break

i = 0
while x[i]!=0:
    out = dig_sum(x[i])
    print(out)
    i += 1