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#!/opt/local/bin/lua
--
-- See ../README.md
--
--
-- Run as: lua ch-2.lua < input-file
--
board = {}
local X = 0
local Y = 0
for line in io . lines () do
X = X + 1
board [X] = {}
local y = 0
for c in line : gmatch ("([x*])") do
y = y + 1
board [X] [y] = c
end
Y = y
end
for x = 1, X do
for y = 1, Y do
if y > 1 then
io . write (" ")
end
if board [x] [y] == "x" then
io . write ("x")
goto end_y
end
local count = 0
for dx = -1, 1 do
if x + dx < 1 or x + dx > X then
goto end_dx
end
for dy = -1, 1 do
if y + dy < 1 or y + dy > Y then
goto end_dy
end
if dx == 0 and dy == 0 then
goto end_dy
end
if board [x + dx] [y + dy] == "x" then
count = count + 1
end
::end_dy::
end
::end_dx::
end
io . write (count)
::end_y::
end
io . write ("\n")
end
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