text: import time
  from tkinter import *
  from tkinter import messagebox
  
  # creating Tk window
  root = Tk()
  
  # setting geometry of tk window
  root.geometry("300x250")
  root.configure(background= 'light blue')
  
  
  # Using title() to display a message in
  # the dialogue box of the message in the
  # title bar.
  root.title("Time Counter")
  
  # Declaration of variables
  hour = StringVar()
  minute = StringVar()
  second = StringVar()
  
  # setting the default value as 0
  hour.set("00")
  minute.set("00")
  second.set("00")
  
  # Use of Entry class to take input from the user
  hourEntry = Entry(root, width=3, font=("Arial", 19, ""),
                    textvariable=hour)
  hourEntry.place(x=80, y=20)
  
  minuteEntry = Entry(root, width=3, font=("Arial", 19, ""),
                      textvariable=minute)
  minuteEntry.place(x=130, y=20)
  
  secondEntry = Entry(root, width=3, font=("Arial", 19, ""),
                      textvariable=second)
  secondEntry.place(x=180, y=20)
  
  def submit():
      
      try:
          # the input provided by the user is
          # stored in here :temp
          temp = int(hour.get()) * 3600 + int(minute.get()) * 60 + int(second.get())
      except:
          print("Please input the right value")
      while temp > -1:
  
          # divmod(firstvalue = temp//60, secondvalue = temp%60)
          mins, secs = divmod(temp, 60)
  
          # Converting the input entered in mins or secs to hours,
          # mins ,secs(input = 110 min --> 120*60 = 6600 => 1hr :
          # 50min: 0sec)
          hours = 0
          if mins > 60:
              # divmod(firstvalue = temp//60, secondvalue
              # = temp%60)
              hours, mins = divmod(mins, 60)
  
          # using format () method to store the value up to
          # two decimal places
          hour.set("{0:2d}".format(hours))
          minute.set("{0:2d}".format(mins))
          second.set("{0:2d}".format(secs))
  
          # updating the GUI window after decrementing the
          # temp value every time
          root.update()
          time.sleep(1)
  
          # when temp value = 0; then a messagebox pop's up
          # with a message:"Time's up"
          if (temp == 0):
              messagebox.showinfo("Time Countdown", "Time's up ")
  
          # after every one sec the value of temp will be decremented
          # by one
          temp -= 1
  def t_t():
      exec(open('Tic.py').read(),globals(),globals())
  
  
  # Button widget
  btn = Button(root, text='Set Time Countdown', bd='5',bg='white',fg='Black', font=('Courier',15,'bold'),
               command=submit)
  btn.place(x=50, y=140)
  bt=Button(root, text='Start Game' , bd='6',bg='white',fg='Black',font=('Courier',15,'bold'),
               command=t_t)
  bt.place(x=90 ,y=80)
  
  # infinite loop which is required to
  # run tkinter program infinitely
  # until an interrupt occurs
  root.mainloop()
  