a0,b0,c0 = map(int,raw_input().split("."))
a1,b1,c1 = map(int,raw_input().split("."))
if a0 > a1:
	print "YES"
elif a0 < a1:
	print "NO"
elif b0 > b1:
	print "YES"
elif b0 < b1:
	print "NO"
elif c0 >= c1:
	print "YES"
else:
	print "NO"