a = map(int,raw_input().split('.'))
b = map(int,raw_input().split('.'))
if a[0] > b[0]:
	print 'YES'
elif a[0] == b[0] and a[1] > b[1]:
	print 'YES'
elif a[0] == b[0] and a[1] == b[1] and a[2] <= b[2]:
	print 'YES'
else:
	print 'NO'