FarmerVsPests

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Farmer John has always done his best to keep the pastures full of
luscious, delicious healthy grass for the cows. He has lost the
battle, though, as the evil milkweed has attained a foothold in the
northwest part of his farm.
The pasture, as usual, is partitioned into a rectilinear grid of
height Y (1 <= Y <= 100) and width X (1 <= X <= 100) with (1,1)
being in the lower left corner (i.e., arranged as a normal X,Y
coordinate grid). The milkweed has initially begun growing at square
(Mx,My). Each week the milkweed propagates to all nonrocky squares
that surround any square it already occupies, as many as eight more
squares (both the rectilinear squares and the diagonals). After
only one week in those squares, it is ready to move on to more
squares.
Bessie wants to enjoy all the grass she can before the pastures are
taken over by milkweed. She wonders how long it can last. If the
milkweed is in square (Mx,My) at time zero, at what time does it
complete its invasion of the pasture (which, for the given input
data, will always happen)?
The pasture is described by a picture with '.'s for grass and '*'s
for boulders, like this example with X=4 and Y=3:
.... ..*. .**.
If the milkweed started in the lower left corner (row=1, column=1),
then the map would progress like this:
.... .... MMM. MMMM MMMM ..*. MM*. MM*. MM*M MM*M M**. M**. M**. M**. M**M week 0 1 2 3 4
The milkweed has taken over the entire field after 4 weeks.
INPUT FORMAT:
* Line 1: Four spaceseparated integers: X, Y, Mx, and My
* Lines 2..Y+1: Line y+1 describes row (Y+2y) of the field with X
characters ('.' for grass and '*' for a boulder)
SAMPLE INPUT
4 3 1 1 .... ..*. .**.
OUTPUT FORMAT:
* Line 1: A single integer that is the week number when the milkweed
takes over the last remaining nonboulder square of the
pasture.
SAMPLE OUTPUT :
4
Author:  shadab 
Tags  shadab 
Date Added:  24092010 
Time Limit:  1 sec 
Source Limit:  50000 Bytes 
Languages:  ADA, ASM, BASH, C, C99 strict, CAML, CLPS, CPP 4.3.2, CPP 6.3, CPP14, CS2, D, ERL, FORT, GO, HASK, ICON, JAVA, LISP clisp, LISP sbcl, LUA, NEM, NICE, NODEJS, PAS fpc, PAS gpc, PERL, PHP, PIKE, PRLG, PYTH, PYTH 3.5, RUBY, SCALA, SCM guile, SCM qobi, ST 
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