n = int(input())
if n == 1:
    print('n')
    exit()

alph = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
for bit in range(n):
    temp = 'a'
    bitc = bit
    for i in range(5):
        temp += alph[bitc % 26]
        bitc //= 26
    temp += 'a'
    if bit == n - 1:
        temp += 'n'
    print(temp)