import random
import string


n = int(input())

s = [list(random.choice(string.ascii_letters) for _ in range(random.randint(1, 20))) for _ in range(n)]

for i, v in enumerate(s):
    if i >= 1 and v[0] != s[i - 1][-1]:
        s[i - 1][-1] = v[0]

i = 0
while i <= len(s) - 1:
    print("".join(s[i]))
    i += 1