(defun main (&rest argv)
  (declare (ignorable argv))
  (let* ((a (read))
         (b (read))
         (c (read))
         (d (read))
         (D (- (* (- a c) (- a c)) (* 8 (- b d)))))
    (cond ((minusp D) (format t "No~%"))
          ((zerop D) (format t "Yes~%"))
          (t
            (let* ((p (float a 0d0))
                   (q (float b 0d0))
                   (r (float c 0d0))
                  ;(s (float d 0d0))
                   (x1 (/ (- r p (sqrt (float D 0d0))) 4d0))
                   (x2 (/ (+ r (- p) (sqrt (float D 0d0))) 4d0))
                   (y1 (+ (* x1 x1) (* p x1) q))
                   (y2 (+ (* x2 x2) (* p x2) q))
                   (n (/ (- y2 y1) (- x2 x1)))
                   (m (- y1 (* n x1))))
              (format t "~f ~f~%" n m))))))

(main)