list_0 = input().split('.')
list_1 = input().split('.')

flag = 1 # 後者が化石という前提

for i in range(3):
    if int(list_0[i]) < int(list_1[i]):
        flag = flag * 0
        
if list_0 == list_1:
    flag = 1
    
if flag:
    print('YES')
else:
    print('NO')