# Takes a line s and replaces all punctuation marks given
# in the list punctuationMarkes by blanks; returns the modified list
def filterOutPunctuation(punctuationMarks, s):
	for mark in punctuationMarks:
		s = s.replace(mark, " ")

	return s


# Returns the list obtained by deleting all duplicates
# from L
def removeDuplicates(L):
	newL = []
	for word in L:
		if word not in newL:
			newL = newL + [word]

	return newL
		


#Main program
print "Enter some text"

s = raw_input().lower()
L = []
punctuationMarks = [",", ".", ":", ";", "!", "/", "?", '"']

while s:
	s = filterOutPunctuation(punctuationMarks, s)	
	L = L + s.split()
	s = raw_input().lower()

print sorted(removeDuplicates(L))