import sys
A = input().split(".")
B = input().split(".")
for x in range(len(B[0])):
	if int(B[0]) > int(A[0]):
		print("NO")
		sys.exit()
	if int(B[0]) < int(A[0]):
		print("YES")
		sys.exit()
for x in range(len(B[1])):
	if int(B[1]) > int(A[1]):
		print("NO")
		sys.exit()
	if int(B[1]) < int(A[1]):
		print("YES")
		sys.exit()
for x in range(len(B[2])):
	if int(B[2]) > int(A[2]):
		print("NO")
		sys.exit()
	if int(B[2]) <= int(A[2]):
		print("YES")
		sys.exit()