N = int(input())

L = ["b", "c", "d", "e", "f", "g", "h", "i", "j"]
cnt = 0
import itertools
for p in itertools.permutations(L):
    if cnt == N-1:
        break
    ans = "a"
    for s in p:
        ans += s
    ans += "a"
    print(ans)
    cnt += 1

print("an")