from string import ascii_lowercase
from itertools import product

R=ascii_lowercase
n=R.index("n")
Y=R[:n]+R[n+1:]+R[0]

N=int(input())

Z=list(product(R,repeat=3))

X=[""]*N
for i in range(N):
    q=i//25
    r=i%25

    if (i-1)//25!=q:
        W=""
        for b in Z[q]:
            W+=b

    X[i]=Y[r]+W+Y[r+1]

    if i==N-1:
        X[i]=X[i][:-1]+"n"
print("\n".join(X))