import time
def countdown(num_of_secs):
while num_of_secs:
m, s = divmod(num_of_secs, 60)
min_sec_format = '{:02d}:{:02d}'.format(m, s)
print(min_sec_format, end='/r')
time.sleep(1)
num_of_secs -= 1
print('Countdown finished.')
inp = input('Input number of seconds to countdown: ')
countdown(inp)