s=gets.chomp
w=0
e=0
i=0

while s.size>i
	c=s[i]
	if c=="O" then
		e=e+1
		w=0
	else
		w=w+1
		e=0
	end
	if e==3 then
		puts "East"
		break
	elsif w==3 then
		puts "West"
		break
	end
	i=i+1
end
if w<3 && e<3 then
	puts "NA"
end