print((function (s)
	local e,w=0,0
	for i=1,#s do
		if s:sub(i,i)=="O" then e,w=e+1,0 else e,w=0,w+1 end
		if e==3 then return "East" end
		if w==3 then return "West" end
	end
	return "NA"
end)(io.stdin:read("*l")))