Check answers

problem

AOR Ika is studying to pass the test.

AOR Ika-chan solved the $N$ question. After that, round the solved problem according to the following procedure.

1. Check the correctness of the answer.
2. If the answer is correct, write a circle mark, and if it is incorrect, write a cross mark on the answer sheet.

AOR Ika faints because of the fear of failing the test the moment she finds that the answer is wrong for $2$ in a row. And no further rounding is possible.

Syncope occurs between steps $1$ and $2$.

You will be given an integer $N$, which represents the number of questions AOR Ika has solved, and a string $S$, which is a length $N$ and represents the correctness of the answer. The string consists of'o'and'x', with'o' indicating the correct answer and'x' indicating the incorrect answer. The $i$ letter indicates the correctness of the $i$ question, and AOR Ika-chan rounds the $1$ question in order.

Please output the number of questions that AOR Ika-chan can write the correctness.

output

Output the number of questions that AOR Ika-chan could write in the $1$ line. Also, output a line break at the end.

Example

Input

3 oxx

Output

2

inputFormat

outputFormat

output the number of questions that AOR Ika-chan can write the correctness.

output

Output the number of questions that AOR Ika-chan could write in the $1$ line. Also, output a line break at the end.

Example

Input

3 oxx

Output

2

样例

3
oxx

2