import random, string

def randomname(n):
   randlst = [random.choice(string.ascii_lowercase) for i in range(n)]
   return randlst

n = int(input())

if n == 1:
    print('n')
else:
    ans = []
    for i in range(n-1):
        ls = ['a']
        lm = randomname(18)
        le = ['a']
        ans.append(ls + lm + le)
    for i in ans:
        print(''.join(i))
    print('an')