# XieGang and FanXieGang

Time Limit: 6000/3000 MS (Java/Others)

Memory Limit: 32768/32768 K (Java/Others)

## Description

As we know, ‘/’ in chinese is “Xie Gang”, and ‘\’ is “Fan Xie Gang”, we can use them to build a beautiful labyrinth, for example :

here ‘/’ and ‘\’ in the labyrinth means walls, the wall which can’t separate two rooms we call it “inner wall”, for example, in he figure below, there are three “inner wall”s.

## Input

There are no more than 20000 cases. each case contains two integers n and m（n,m<=500）, the width and the height of the labyrinth, The next m lines represent the labyrinth itself, and contain n characters each, all these characters will be "/" or "\".

## Output

Output one integer represents the number of “inner wall”.

## Sample Input

3 3
\/\
/\\
/\/
4 4
////
\\\\
////
\\\\

## Sample Output

2
0

lcy

## Source

HDOJ Monthly Contest – 2010.04.04