results = set()


def addWord():
  while True:
    word = (yield)
    results.add(word)

def upperWord(targetCR):
  while True:
    word = (yield)
    targetCR.send(word.upper())

def wordNoPeriods(targetCR):
  while True:
    word = (yield)

    word = word.replace(".", "")
    word = word.replace(",", "")
    word = word.replace(":", "")
    word = word.replace(";", "")
    word = word.replace("-", "")


    targetCR.send(word.replace(".",""))

def wordGenerator(fileName):
    pw = printWord(); pw.next()
    uw = upperWord(pw); uw.next()
    wnp = wordNoPeriods(uw); wnp.next()

    inputFile = open(fileName)
    lines  = inputFile.readlines()
    for line in lines:
        for word in line.split():
            wnp.send(word)
    print results

wordGenerator("input.txt")