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.

Example

Input

123
55
1000
0


Output

6
10
1
def calc_sum(num):
    total = 0
    while num > 0:
        r = num % 10
        q = num // 10
        num = q
        total += r

    return total
# <--- function

# --> main roution
while True:
    n = int(input())
    if n == 0:
        break
    print(calc_sum(n))  
