Hours = input('Enter the current hour: ')
Minutes = input('Enter the current minute: ')

if int(Hours) > 12 or int(Hours) < 1:
    Hours = input('You entered an incorrect value for Hours. Please, try again: ')
if int(Minutes) > 60 or int(Minutes) < 0:
    Minutes = input('You entered an incorrect value for Minutes. Please, try again: ')

if int(Hours) > 12 or int(Hours) < 1:
    Hours = 1
if int(Minutes) > 60 or int(Minutes) < 0:
    Minutes = 0

AMPM = input('Please enter AM or PM: ')

if AMPM == "Am" or AMPM == "am":
    AMPM = "AM"
if AMPM == "Pm" or AMPM == "pm":
    AMPM = "PM"

if AMPM is not "AM" or AMPM is not "PM":
    AMPM = input('You entered an incorrect value for AMPM. Please, try again: ')

if AMPM == "Am" or AMPM == "am":
    AMPM = "AM"
if AMPM == "Pm" or AMPM == "pm":
    AMPM = "PM"

if AMPM is not "AM" or AMPM is not "PM":
    AMPM = "AM"

Runclock = 1
Seconds = 0
Display = 0

import time

while Runclock == 1:

    Seconds = int(Seconds) + 1

    if Seconds == 60:
        Seconds = 0
        Minutes = int(Minutes) - 1

    if Minutes == 60:
        Minutes = 0
        Hours = Hours + 1

    if Hours == 13:
        Hours = 1

    if Hours == 12 and Seconds == 0 and AMPM == 'AM':
        AMPM = PM
    if Hours == 12 and Seconds == 0 and AMPM == 'PM':
        AMPM == AM

    time.sleep(1)
    Display = ('') + repr(AMPM) + (' H=') + repr(Hours) + (' M=') + repr(Minutes) + (' S=') + repr(Seconds)
    print(Display)