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)

while True:
    x=int(input())
    if x==0:
        break
    else:
        y=str(x)
        z=len(y)
        i=0
        sum=0
        for i in range(z):
            i+=1
            sum+=int(y[i-1])
        print(sum)