e-olymp
Competitions

December 2 - BMTK Programming School, Small League

Number of odd digits

Find the number of odd digits in a positive integer n.

Input

One positive integer n (n < 1018).

Output

Print the number of odd digit in positive integer n.

Time limit 1 second
Memory limit 128 MiB
Input example #1
2354
Output example #1
2
Input example #2
606432232464677
Output example #2
4