title: OpenCV findContours are in reverse order
body: <p>Why the contour is in reverse order? I use the RETR_EXTERNAL flag for contours hierarchy for detect only the external contours</p>
  
  <p>_, contours, hierarchy = cv2.findContours(connected.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)</p>
  
  <p><a href="https://i.stack.imgur.com/BB7eu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BB7eu.png" alt="enter image description here"></a></p>
  
  <p>For example my my output is r,e B, why in reverse order? </p>