from random import randrange ## randrange(1,10) return 1 <= x < 10 
from random import randint ## randint(1,10) return 1 <= x <= 10

n = int(input())
now = 'a'

for i in range(n):
    ans = now

    for j in range(18):
        ans += (chr)(ord('a') + randrange(0,26))

    now = (chr)(ord(now) + 1)
    if now == 'n':
        now = 'o'
    
    ans += now
    print(ans)