from tkinter import *


class Node:
    def __init__(self, value=None, next=None):
        self.cargo = value
        self.next = next

    def __str__(self):
        out = str(self.cargo)
        return out


class List:
    def __init__(self):
        self.head = None
        self.end = None
        self.length = 0

    def __str__(self):
        if self.head is not None:
            current = self.head
            out = 'List: [ ' + str(current.cargo) + ' '
            while current.next is not None:
                current = current.next
                out += str(current.cargo) + ' '
            return out + ']'
        else:
            out = 'List is clear'
            return out

    def add(self, x):
        self.length += 1
        if self.head is None:
            self.end = self.head = Node(x, None)
        else:
            self.end.next = self.end = Node(x, None)

    def clear(self):
        self.__init__()

    def remove(self, i):
        if self.head is None:
            return
        curr = self.head
        count = 0
        if i == 0:
            self.head = self.head.next
            self.length -= 1
            return
        while curr is not None:
            if count == i:
                if curr.next is None:
                    self.end = curr
                old.next = curr.next
                self.length -= 1
                break
            old = curr
            curr = curr.next
            count += 1

    def search(self):
        while True:
            num = 0
            coun = 0
            curr = self.head
            deleted = False
            found = False
            for i in range(0, self.length):
                if curr.cargo % 4 == 0:
                    found = True
                    coun += 1
                    num += coun
                    coun = 0
                else:
                    coun += 1
                curr = curr.next
            if found is True:
                self.remove(num-1)
                deleted = True
            if deleted is False:
                break


L = List()
root = Tk()
root.title("Laba 1")
root.geometry("640x360+0+0")
root.resizable(False, False)
text = Text(wrap=WORD)
text.place(x=50, y=250, height=66, width=399)
txt = Entry()
txt.place(x=50, y=100, height=33, width=133)


def new():
    s = txt.get()
    s = int(s)
    L.add(s)
    txt.delete(0, END)


add = Button(root, text="Add", command=new)
add.place(x=50, y=50, height=33, width=133)


def output():
    text.delete(1.0, END)
    s = L.__str__()
    text.insert(1.0, s)


def remove():
    L.search()
    if L.head is not None:
        add.config(state=DISABLED)


show = Button(root, text="Print", command=output)
show.place(x=200, y=100, height=33, width=133)
replace = Button(root, text="Delete", command=remove)
replace.place(x=200, y=50, height=33, width=133)
root.mainloop()