题解 | #牛牛的计划#

import sys
from datetime import datetime  
start_list = ''.join(input().split())
now_list = ''.join(input().split())
start_date = datetime.strptime(start_list,'%Y%m%d')
now_date = datetime.strptime(now_list,'%Y%m%d')
print('yes' if start_date<=now_date else 'no')