def hoge() 
    s = ""
    18.times do
        s += (rand(26) + ?a.ord).chr
    end
end

n = gets.to_i
n.times do |i|
    foo = hoge()
    if i + 1 == n
        puts "a" + hoge(h) + "n"
    else
        puts "a" + hoge(h) + "a"
    end
end