#!/bin/python3

def MyStrip(word) :
   rv = ""
   for letter in word:
       l = letter.lower()
       if l.isalpha():
            rv += l
   return rv

f = open('ocap.txt')
s = set() 
for line in f:
    for word in line.strip().split():
        word = MyStrip(word)
        if word != "" :
           s = s.union({word})

for word in sorted(s):
    print (word)