s = gets.chomp.chars
prev = s.first
count = 1

s[1..-1].each do |_s|
  if _s == prev
    count += 1
  else
    count = 1
  end

  break if count == 3

  prev = _s
end

if count == 3
  if prev == 'O'
    puts 'East'
  else
    puts 'West'
  end
else
  puts 'NA'
end