a, b, c, d = gets.split(" ").map{|s| s.to_i}

k = (a - c) ** 2 - 8 * (b - d)

if k < 0 then
	puts "No"
elsif k == 0 then
	puts "Yes"
else
	p = (a + c) / 2.0
	q = (b + d) / 2.0
	puts "#{p} #{q}"
end