In some social platforms, there are some netizen who like to post "www". Since the string is like the grass, which contains plenty of "/\" shapes, so there are also some netizen who post "grass".

As a fast, smart, and convenient browser, MI Browser can recognize this kind of text and show some special effects. Specifically, given a string, MI Browser will determine the number of "/\" shapes made by character "w", where "w" itself and the gap between two adjacent "w"s both give one `/\` shape. If still not clear, please turn to sample input/output for more details.

As a MI fan, you want to detect the relationship between the special effects and the number of "/\" shapes, so the thing you should do first is to determine the number of "/\" shapes by yourself.

Only one line containing a string .

It's guaranteed that s only contains lowercase letters.

Only one line containing one integer, denoting the answer.

wwwvwwvw

9

In "www", there are 5 "/\" shapes.

In "ww", there are 3 "/\" shapes.

In "w", there is only 1 "/\" shape.