import itertools

n = int(input())

s = [chr(i) for i in range(97, 97+26)]
t = list(itertools.permutations(s, 4))

cnt = 0
for i in range(n):
    if cnt >= n - 1 :
        cnt += 1
        print("a" + "".join(t[i]) + "an")
    else:
        cnt += 1
        print("a" + "".join(t[i]) + "a")