import time

def upRange(start, stop, step):
    start = int(start)
    stop = int(stop)
    step = int(step)
    while start <= stop:
        yield start
        start += abs(step)

def downRange(start, stop, step):
    start = int(start)
    stop = int(stop)
    step = int(step)
    while start >= stop:
        yield start
        start -= abs(step)

def sleep(second):
    time.sleep(int(second))