s = gets.chomp
for i in 0..(s.length - 2)
    if s[i] == "O" && s[i+1] == "O" && s[i+2] == "O"
        puts "East"
        return
    elsif s[i] == "X" && s[i+1] == "X" && s[i+2] == "X"
        puts "West"
        return
    end
end
puts "NA"