AT_abc469_b [ABC469B] Isolated Seats

You are given a string $ S $ of length $ N $ consisting of `o` and `x`. $ N $ chairs are arranged in a row from left to right. If the $ i $ -th character of $ S $ is `o`, a person is sitting in the $ i $ -th chair from the left; if it is `x`, no person is sitting there. Find the number of chairs that satisfy all of the following conditions. - No person is sitting in it. - There is no chair to its left, or no person is sitting in the chair to its left. - There is no chair to its right, or no person is sitting in the chair to its right.

The input is given from Standard Input in the following format: > $ N $ $ S $

Output the answer in one line.

### Sample Explanation 1 Only the first and fifth chairs from the left satisfy the conditions. ### Constraints - $ 1 \leq N \leq 100 $ - $ N $ is an integer. - $ S $ is a string of length $ N $ consisting of `o` and `x`.