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
while 1:
    input = raw_input()
    num = len(input)
    input = int(input)
    
    if input == 0:
        break
        
    count = 0
    for i in range(num, 0, -1):
        value = int(input / 10**(i-1))
        input -= value * 10 ** (i-1)
        count += value

    print(count)