import string

class Parser:

	def __init__(self):
		self.curstr = ''
		self.ClearOutput()
		self.it = ''

	def ClearOutput(self):
		self.verb = ''
		self.toobj = ''
		self.dirobj = ''
		self.inobj = ''
		self.atobj = ''
		self.withobj = ''
	
	def Parse(self,pStr):
#		print '(Parsing: '+pStr+')'
		self.ClearOutput()

		# convert commas to conjunctions
		str = string.join(string.split(pStr,','), ' and ')

		# get words; strip out garbage
		words = filter(lambda x,g=garbs: x not in g, string.split(str))

			
		# first word should be a verb -- if not, assume 'use'
		w = 0
		if words[w] in verbs:
			self.verb = words[w]
			w = w + 1
		else:	self.verb = 'use'

		# after verb: nothing, noun or conjuction
		if len(words) < w+1: return ''		# no more words

		if words[w] in nouns:			# verb, noun
			if words[w] == 'it': words[w] = self.it
			self.dirobj = words[w]
			self.it = words[w]
			if len(words) < w+2: return ''
			if words[w+1] in nouns:		# V IO DO
				if words[w+1] == 'it': words[w+1] = self.it
				self.toobj = words[w]
				self.dirobj = words[w+1]
				self.it = words[w+1]
				# eat the direct object
				words.remove(words[w+1])
			# eat the noun (IO or DO)
			words.remove(words[w])

		if len(words) < w+1: return ''		# no more words

		while len(words) > w and words[w] in preps:
			if len(words) < w+2 or words[w+1] not in nouns:
				print "..." + words[w] + " WHAT?!?"
				return ''
			if words[w+1] == 'it': words[w+1] = self.it
			if words[w] == 'at': self.atobj = words[w+1]
			elif words[w] == 'in' or words[w] == 'into' or words[w] == 'from': self.inobj = words[w+1]
			elif words[w] == 'with': self.withobj = words[w+1]
			elif words[w] == 'to': self.toobj = words[w+1]
			else: print "ERROR: unknown preposition " + words[w]
			self.it = words[w+1]
			# eat the object of the preposition
			words.remove(words[w+1])
			if len(words) < w+2 or words[w+1] not in preps:
				w = w+1

		if len(words) < w+1: return ''		# no more words

		while words[w] in conjs:			# V {N {N}} Conj
			# eat conjunction
			words.remove(words[w])
			# if next word is a verb, eat everything up to that
			if words[w] in verbs: words = words[w:]
			# if next word is anything except another conjunction, return
			if len(words) < w+1: return ''		# no more words
			if words[w] not in conjs: return string.join(words)

		# after verb and nouns: nothing
		if len(words) < w+1: return ''		# no more words


		print 'Warning: unknown word '+words[w]


# class variables -- dictionary items, etc.

verbs = ['drop','get','go','i','inv','look','take','eat','give','put','use']
nouns = ['it','box','rock','bird']
conjs = ['and','then']
preps = ['at','in','into','with','from','to']
garbs = ['the','a']

# test function
def test():
	p = Parser()
	while 1:
		str = raw_input('>')
		while str:
			str = p.Parse(str)
			print [p.verb, p.dirobj, p.toobj, p.inobj, p.atobj, p.withobj]