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

const bound = 'z'.ord - 'a'.ord# [0,bound] まで使える
var cache : array[10,char]
proc printAsciis(a:int,useCache:bool=false) =
  if a == 0:
    putchar_unlocked('a')
    return
  if useCache:
    for i in 0..<10:
      if cache[i] == '\0': return
      putchar_unlocked(cache[i])
  var n = a
  var i = 0
  while n > 0:
    var c = chr('a'.ord + (n mod bound))
    if c == 'n' : c = 'z'
    putchar_unlocked(c)
    cache[i] = c
    i += 1
    n = n div bound

let n = stdin.readLine().parseInt()
for i in 0..<n div 2:
  putchar_unlocked('a')
  i.printAsciis()
  putchar_unlocked('b')
  putchar_unlocked('\n')
  putchar_unlocked('b')
  i.printAsciis(true)
  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:
  putchar_unlocked('a')
  (n div 2).printAsciis()
  putchar_unlocked('n')
  putchar_unlocked('\n')