import random
n = int(input())
moji = list("abcdefghijklmopqrstuvwxyz")
last = "a"
for i in range(n):
    x = random.sample(moji, 12)
    if i != n-1:
        print(last + "".join(x))
        last = x[-1]
    else:
        print(last + "".join(x) + "n")