datetime处理日期真是太省心了

import datetime as dt

d1 = dt.datetime.strptime(input(), '%Y%m%d')
d2 = dt.datetime.strptime('99991231', '%Y%m%d')
flag = 1

while d1<d2:
	d1 += dt.timedelta(days = 1)
	ind = d1.strftime('%Y%m%d')
	if ind==ind[::-1]:
		if flag:
			print(ind)
			flag = 0
		if ind[1]==ind[3] and ind[0]==ind[2] and ind[1]!=ind[0]:
			print(ind)
			break