import sys

def cd():
  print "called cd"

def clr():
  print "called clr"

def pwd():
  print "called pwr"

def exit():
  print "called exit"
  sys.exit(0)

commands = {'cd':cd, 'clr':clr, 'pwd':pwd, 'exit':exit}

while 1:
  cmd=sys.stdin.readline().strip()
  proc=commands[cmd]
  proc()