s=gets.chomp
n=s.size
cnte = 0
cntw = 0
n.times do |i|
    if s[i] == 'O'
        cnte += 1
        cntw = 0
    else
        cntw += 1
        cnte = 0
    end
    if cnte == 3
        puts "East"
        exit
    elsif cntw == 3
        puts "West"
        exit
    end
end
puts "NA"