import strutils
proc putchar_unlocked(c:char){.header: "<stdio.h>" .}

const bound = 'z'.ord - 'a'.ord# [0,bound] まで使える
proc getAsciis(a:int): string =
  if a == 0: return "a"
  result = ""
  var n = a
  while n > 0:
    var c = chr('a'.ord + (n mod bound))
    if c == 'n' : c = 'z'
    result &= c
    n = n div bound

let n = stdin.readLine().parseInt()
for i in 0..<n div 2:
  let S = i.getAsciis()
  putchar_unlocked('a')
  for s in S: putchar_unlocked(s)
  putchar_unlocked('b')
  putchar_unlocked('\n')
  putchar_unlocked('b')
  for s in S: putchar_unlocked(s)
  if n mod 2 == 0 and i == n div 2 - 1:
    putchar_unlocked('n')
  else:putchar_unlocked('a')
  putchar_unlocked('\n')

if n mod 2 == 1:
  let S = (n div 2).getAsciis()
  putchar_unlocked('a')
  for s in S: putchar_unlocked(s)
  putchar_unlocked('n')
  putchar_unlocked('\n')