fun main(args:Array<String>) {
  val n = readLine()!!.toInt()
  
  val s = (0..9).zip( "abcdefghei".toList() ).map { 
    val (num, char) = it
    Pair(num.toString(), char.toString())
  }.toMap()
  val buffs = mutableListOf<String>("an")
  (1..n-1).map { 
    var numstr = "a%.8fa".format(Math.random()).replace("0.", "")
    s.map { (s,t) ->
      numstr = numstr.replace( s, t )
    }
    buffs.add(numstr)
  }
  buffs.reversed().joinToString("\n").run(::println)
}