#-swank
(unless (member :child-sbcl *features*)
  (quit
   :recklessly-p t
   :unix-status
   (process-exit-code
    (run-program *runtime-pathname*
                 `("--control-stack-size" "1024MB"
                   "--noinform" "--disable-ldb" "--lose-on-corruption" "--end-runtime-options"
                   "--eval" "(push :child-sbcl *features*)"
                   "--script" ,(namestring *load-pathname*))
                 :output t :error t :input t))))

(defun main ()
  (let* ((N (read))
         (S (read))
         (P (loop for i from 1 to N collect (read)))
         (p (append (mapcar #'(lambda (x i) (list x (1+ i))) P (loop for i from 0 below N collect i))
                    (list (list (- (ash 1 60)) -1) (list (ash 1 60) -1)))))
    (setf p (sort p #'< :key #'first))
    (let ((ans (loop for i from 1 below (1+ N)
                     for near = (min (- (first (nth i p)) (first (nth (1- i) p)))
                                     (- (first (nth (1+ i) p)) (first (nth i p))))
                     if (> near S) collect (second (nth i p)))))
      (setf ans (sort ans #'<))
      (format t "~D~%" (length ans))
      (dolist (elem ans)
        (format t "~D " elem))
      (terpri))))

(main)