import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import random

N = int(read())

alphabets = tuple(chr(ord('a')+x) for x in range(26))

for _ in range(N-1):
    word = 'a' + ''.join(random.choice(alphabets) for _ in range(18)) + 'a'
    print(word)
print('an')