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
import sys

while True:
	line = sys.stdin.readline().rstrip()
	t = sum( [ int( line[i] ) for i in range( len( line ) ) ] )
	if 0 == t:
		break
	else:
		print( t )