from collections import defaultdict
import random
n = int(input())
al = [chr(i) for i in range(97, 97+26)]
d = defaultdict(bool)

for i in range(n-1):
    ok = False
    while not ok:
        ans = ""
        for g in range(6):
            rnd = random.randint(0, len(al)-1)
            ans += al[rnd]
        if not d[ans]:
            print("a"+ ans +"a")
            d[ans] = True
            ok = True
print("an")