Did you know that certain crops cannot grow next to each other? Given the layout of a field as a grid, determine which spots are safe for new crops.
The layout of a field will be given as rows of asterisks (indicating a spot occupied by an incompatible crop) and dots (indicating a free spot).
.**... *..... ....**
A free spot is safe only if the 4 adjacent spots (the spots immediately above, below, left, and right) are not occupied by an incompatible crop.
In the example above, there are 5 safe spots:
.**.XX *..X.. .XX.**
The input will contain two integers () and ().
This will be followed by lines, each with characters.
Print the number of free spots.
6 6 ****.. *****. ..*.** .*...* .*.**. ..**..