import random
source_str = 'abcdefghijklmopqrstuvwxyz'
n=int(input())

d=[]
last=random.choice(source_str)
for j in range(n):
    d=[]
    d.append(last)
    for i in range(18):
        d.append(random.choice(source_str))     
    if(j==n-1):
        d.append("n")
    last=d[-1]
    print("".join(d))