Please choose the correct ending to complete the given sentence: Health: [header] How to put in ortho k lens [title] Clean your face and hands. [step] Since you will be touching your eye directly when inserting the contact lenses, you'll want to avoid getting any dirt or germs into your eyes. Wash your hands with soap for at least 30 seconds, and dry them on a clean towel.

Ending1: [title] Buy an ortho k lens pack that is 32-20 mb (11-16 gb) in size. [step] The glue is usually a sticker and the lens holder is heavier at the top than it is on the front. Ending2: [substeps] If you have long hair, tie it up while you're putting in the contact lenses. Hair can distract you by getting in your eyes, and could also transmit dirt and germs onto the lenses. Ending3: You may wish to scrub the lenses gently with a soft brush or cloth. [title] Try to make contact with the lenses. Ending4: [substeps] If you have oily skin or dry skin, put on some moisturizer before putting in the contact lenses. Reduce the risk of getting the lenses stuck in your eyes, and wipe away any dirt, oil, or debris that leaks into the eye.

Answer format: ending1/ending2/ending3/ending4