func main()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var c: int :: cui@inputInt()
	var d: int :: cui@inputInt()
	var det: int :: (a - b) ^ 2 - 4 * 2 * (b - d)
	if(det = 0)
		do cui@print("Yes\n")
		ret
	end if
	if(det < 0)
		do cui@print("No\n")
		ret
	end if
	do cui@print("\{(a + c) $ float / 2.0} \{(b + d) $ float / 2.0}\n")
end func