#-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 fast-read-lines ()
  (with-open-file (stream *standard-input*
                          :direction :input
                          :element-type '(unsigned-byte 8)
                          :external-format :utf-8)
    (let ((content (make-array 1024 :element-type 'character :adjustable t :fill-pointer 0)))
      (loop for line = (read-line stream nil)
            while line
            do (vector-push-extend line content)
               (vector-push-extend #\Newline content))
      (coerce content 'string))))

(defun fast-write-lines (lines)
  (with-open-file (stream *standard-output*
                          :direction :output
                          :element-type '(unsigned-byte 8)
                          :external-format :utf-8)
    (loop for line in lines
          do (write-string line stream)
             (write-char #\Newline stream))))

(defun main ()
  (let* ((input (fast-read-lines))
         (input-lines (split-sequence #\Newline input))
         (N (parse-integer (first input-lines)))
         (S (parse-integer (second input-lines)))
         (P (mapcar #'parse-integer (subseq input-lines 2 (1+ N))))
         (indexed-P (mapcar #'(lambda (x i) (list x (1+ i))) P (loop for i from 0 below N collect i)))
         (sorted-P (sort indexed-P #'< :key #'first))
         (result '()))
    (loop for i from 0 below N
          for (value index) = (nth i sorted-P)
          for left-diff = (if (> i 0) (- value (first (nth (1- i) sorted-P))) most-positive-fixnum)
          for right-diff = (if (< i (1- N)) (- (first (nth (1+ i) sorted-P)) value) most-positive-fixnum)
          for near = (min left-diff right-diff)
          when (> near S) do (push index result))
    (setf result (sort result #'<))
    (fast-write-lines (list (write-to-string (length result)) (map 'string #'write-to-string result)))))

(main)