# Theme_2.9, 06. Triples of Latin Letters
n = int(input())  # an integer n

for i in range(ord('a'), ord('a') + n):
    # print(i)
    for j in range(ord('a'), ord('a') + n):
        for k in range(ord('a'), ord('a') + n):
            print(f'{chr(i)}{chr(j)}{chr(k)}')