before = "s"
word = []

(gets.to_i - 1).times do
	after = (0..8).map{ ('a'..'m').to_a[rand(12)] }.join
	newword = before + after
	if word.include?(newword)
		redo
	else 
		puts newword
		word << newword
	end

	before = after
end

puts before + "n"