ver1 = gets.chomp.split('.')
ver2 = gets.chomp.split('.')
flag = 1

2.downto(0){|i|
	if ver2[i] > ver1[i]
		flag = 0
	elsif ver2[i] < ver1[i]
		flag = 1
	end
}
puts flag == 1 ? "YES" : "NO"