n=int(input())
t=""
letters = 'abcdefghijklmopqrstuvwxyz'
for i in range(n):
    m=random.choices(letters,k=random.randrange(1,18))
    moji=t+''.join(m)
    t=moji[-1:]
    if i==n-1:
        moji=moji+'n'
    print(moji)