import string
import random

def randomString(l):
    return ''.join([random.choice(string.ascii_lowercase) for _ in range(l)])
    
n = int(raw_input())
ls = []
for _ in range(n-1):
    s = randomString(15)
    while s in ls:
        s = randomString(15)
    ls.append(s)
    print "a" + s + "a"
s = randomString(15)
while s in ls:
    s = randomString(15)
print "a" + s + "n"