498
import datetime
n = input()
start = datetime.date(int(n[:4]), int(n[4:6]), int(n[6:]))
delta = datetime.timedelta(days=1)
flag = 0
for i in range(1000*365):
start += delta
display_str = str(start)[:4] + str(start)[5:7] + str(start)[8:]
if display_str == display_str[::-1]:
if flag == 0:
print(display_str)
flag = 1
if display_str[:2] == display_str[2:4]:
print(display_str)
break
python标准库-datetime