Question: How to mail a letter.
Option 0: Once you've chosen the envelope for your letter, place it inside and lick the edge of the envelope to moisten the glue, then press it shut to seal the letter. Write the address and attach a stamp.
Option 1: Once you've chosen the envelope for your letter, place it inside and lick the edge of the envelope to moisten the glue, then press it shut to seal the letter. Then place it in the mailbox for delivery.
Answer: 0