class Stack:
    def __init__(self):
        self.items = []

    def isEmpty(self):
        return self.items == []

    def push(self, item):
        self.items.insert(0, item)

    def pop(self):
        return self.items.pop(0)

    def peek(self):
        return self.items[0]

    def size(self):
        return len(self.items)

def htmlChecker(a):
    import re
    nesne = open("index.html")

    for satirlar in nesne:
        liste = (re.findall("[a-z+1-9]+[>]",satirlar))
        yliste = (re.findall("[/]+[a-z+1-9]+[>]",satirlar))
        listetag = (re.findall("[<].[a-z+1-9]+[>]",satirlar))

    print "TAGs in File:",listetag,"\n"
    xliste = []

    for i in set(liste):
        xliste.append(i)

    print "open TAGs:"

    for i in xliste:
        print i

    print "\nclose TAGs:"

    for i in yliste:
        print i
    print "----->"


    s = Stack()
    balanced = True
    index = 0
    k = a = b = 0


    for k in xliste:
        tag = xliste[a]
        s.push(xliste[a])
        a = a + 1
        for b in yliste:
            if "/" + tag in yliste:
                s.pop
    if s.isEmpty():
        balanced = True

    if balanced and len(xliste) == len(yliste):
        return True
    else:
        return False

def matches(open,close):
    opens = "<"
    closers = "/>"

    return opens.index(open) == closers.index(close)


print htmlChecker("tags")