#!/usr/bin/env python3
"""Freeze detector"""

from time import sleep, time

tt = 0.01

print('Freeze detection started!')

while True:
    x = time()
    sleep(1)
    y = time()
    z = y - x
    a = z - 1
    if a > tt:
        print(
            'Freeze detected; freeze duration: {} sec'.format(
                round(a, 3)))