内存限制：64 MiB 时间限制：5 Sec

Due to recent rains, water has pooled in various places in Farmer
John's field, which is represented by a rectangle of N x M (1 <= N
<= 100; 1 <= M <= 100) squares. Each square contains either water
('W') or dry land ('.'). Farmer John would like to figure out how
many ponds have formed in his field. A pond is a connected set of
squares with water in them, where a square is considered adjacent
to all eight of its neighbors.
Given a diagram of Farmer John's field, determine how many ponds he has.

* Line 1: Two space-separated integers: N and M
* Lines 2..N+1: M characters per line representing one row of Farmer
John's field. Each character is either 'W' or '.'. The
characters do not have spaces between them.

* Line 1: The number of ponds in Farmer John's field.

```
```

10 12

W........WW.

.WWW.....WWW

....WW...WW.

.........WW.

.........W..

..W......W..

.W.W.....WW.

W.W.W.....W.

.W.W......W.

..W.......W.

```
```

3

OUTPUT DETAILS:

There are three ponds: one in the upper left, one in the lower left,

and one along the right side.