def retrieve_and_update_text():
    global CURR_D
    num_d = e1.get().strip()
    ver_d = e2.get().strip()
    print num_d, ver_d

    CURR_D = (CURR_D + 1) % 3
    if CURR_D == 0:
        root.quit()

    v1.set(NUM_D[CURR_D] + 1)
    v2.set(VER_D[CURR_D] + 2)

    root.withdraw()
    root.update_idletasks()
    root.deiconify()