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: Wrong Answer)

answer =[]
while True:
    date = int(input())
    if date == 0:
        break
    a = date//1000
    b = date//100
    c = date//10
    answer.append(a+(b-a*10)+(c-b*10)+(date-c*10))
for j in range(len(answer)):
    print(answer[j])