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    Sorry. I was worried that this might cause confusion. What I meant by "All other characters" is the following:

    Each character in the unencoded message will be sent to exactly one friend. So, in the example "You are all sexy" (with 3 friends), 'Y' goes to friend 1, 'o' goes to friend 2, 'u' goes to friend 3, ' ' goes to friend 1, 'a' goes to friend 2... etc.

    The dashes represent, for each friend, a character that was sent to a different friend. That way, friend 3 knows that there are 2 characters before 'u' because his letter starts "--u".

    I hope that helps.

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    "All other characters are replaced with dashes."

    Isn't space a character too?