clientsDetails.py

import tkinter as tk

firstn@me = input("Enter your firstname: ")
lastname = input("Enter your Lastname: "):
addr = input("Enter your  Addr: ")

rot = tk.Tk()

lblfirstname = tk.Label(root, text="Firstname", foreground="white", background="black" )
respFirstname = tk.Label(root, text=firstname)
lbllastname = tk.Label(root, text="lastname", foreground="white",  background="black")
RESPlastname = tk.Label(root, text=lastname)
lbladdr = tk.Label(root, text="Address", foreground="white",  background="black")
  respaddr = tk.Label(root, text=addr)# Because Of Their Differnt Fonts.

lblfirstname.pack()
 respfirstname.pack()
lbllastname.pack()
   resplastname.pack()
 lbladdr.pack()
 respaddr.pack()

root.mainloop()