#pragma indent
def readlines (acc)
  def line = System.Console.In.ReadLine ()
  if (line == null) acc.ToArray ()
  else readlines (line :: acc)

def lines = readlines ([])
def rand = System.Random ()
def len = lines.Length
repeat (len)
  lines [rand.Next (len)] <-> lines [rand.Next (len)]
foreach (l in lines)
  System.Console.Out.WriteLine (l)