win_or_lose = gets.chomp.split("")
win_count, lose_count = 0, 0

for val in win_or_lose do
	if val == "O"
		win_count += 1
		lose_count = 0
	elsif val == "X"
		lose_count += 1
		win_count = 0
	end
	break if win_count == 3 || lose_count == 3
end

if win_count == 3
	puts "East"
elsif lose_count == 3
	puts "West"
else
	puts "NA"
end