import itertools

n=int(input())

def solve(a):
  if a==1:
    print("n")
    return

  ans="abcdefghi"
  cnt_str="abcdefghijklmopqrstuvwxyz"
  cnt=0
  for s in itertools.permutations(ans):
    start=cnt%25
    end=start+1
    if end==25:
      end=0
    print(cnt_str[start]+"".join(list(s))+cnt_str[end])
    cnt+=1
    if cnt==(a-1):
      print(cnt_str[end]+"".join(list(s))+"n")
      break
  return

solve(n)