Specify a register for a custom command

Hello,

I'd like to create a custom command where the user could specify
the register to use.

Like the ["x]p and ["x]P commands in Vim.

I see that there's a "-register" option that I can use when defining
a custom command, but I'm having trouble understanding how to use it.

For example, I just want to create a command that prints out the contents of a register that is specified by the user.

I tried something like this, but can't print out the <reg> part:

:command! -register Foo :echo You picked this register: <reg>

What am I doing wrong?

Thanks,
--Nate

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