Sharmeen is a little girl who loves digits very much but unfortunately she knows the only digit 0 (Zero). If you give her a number she can tell you how many 0’s are there.

Can you do it for Sharmeen?

Input

You will be given an integer n ( -10^8  <= n <= 10^8 )

Output

You have to print how many 0’s are in this integer.

Example

Input:
100604

Output:
3