local p = {}



local units = {

	year = "^%d*$",

	year_bc = "^%d* BC$",

	year_ad = "^AD %d*$",

	decade = "^%d*0s$",

	decade_bc = "^%d*0s BC$",

	century = "^%d*[snrt][tdh].century$",

	century_bc = "^%d*[snrt][tdh].century BC$",

	millennium = "^%d*[snrt][tdh].millennium$",

	millennium_bc = "^%d*[snrt][tdh].millennium BC$",

}



function p.main(frame)

	local title = mw.title.getCurrentTitle().text



	for unit, pattern in pairs(units) do

		if string.match(title, pattern) then

			return unit

		end

	end



	return -1

end



return p