python 时间下一秒

timeStr = input()

#12:23:23

timeList = timeStr.split(":")

h = int(timeList[0])
m = int(timeList[1])
s = int(timeList[2])

s += 1
if s == 60:
    m += 1
    s = 0
    if m == 60:
        h += 1
        m = 0
        if h == 24:
            h = 0

print("%.2d:%.2d:%.2d" % (h, m, s))