oc = 0
xc = 0
gets.chomp.chars.each do |s|
  if s == 'O'
    oc += 1
    xc = 0
    if oc == 3
      puts 'East'
      exit
    end
  else
    xc += 1
    oc = 0
    if xc == 3
      puts 'West'
      exit
    end
  end
end
puts 'NA'