before = "s"
word = []

(gets.to_i - 1).times do
	after = (0..9).map{ ('a'..'z').to_a[rand(25)] }.join
	if after.include?("n")
		redo
	end

	newword = before + after

	if word.include?(newword)
		redo
	else 
		puts newword
		word << newword
	end

	before = after
end

puts before + "n"