# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

import random

#処理内容
def main():
	N = int(input())
	L = [chr(i) for i in range(97, 110)] + [chr(i) for i in range(111, 123)]
	rand = list(range(25))
	# print(chr(110))
	# print(len(L))
	start = None
	for i in range(N - 1):
		if start == None:
			word = ""
			for j in range(19):
				word += L[random.randrange(25)]
			val = L[random.randrange(25)]
			start = val
			word += val
			print(word)
		else:
			word = start
			for j in range(18):
				word += L[random.randrange(25)]
			val = L[random.randrange(25)]
			start = val
			word += val
			print(word)

	word = start
	for j in range(18):
		word += L[random.randrange(25)]
	word += "n"
	print(word)
	
if __name__ == '__main__':
	main()