### Psychic powers

Pick a number, any number. I am going to use my psychic powers to either predict something about your number, or force you to pick a number that agrees with my prediction.

Well, okay, not *any* number. A 4 digit number with different digits.

Now take the digits of your number and rearrange them into the largest and smallest possible four-digit numbers you can make.

And then subtract them.

Repeat the process until the process changes your new number into itself.

Your new number is

Well, okay, not *any* number. A 4 digit number with different digits.

Now take the digits of your number and rearrange them into the largest and smallest possible four-digit numbers you can make.

And then subtract them.

Repeat the process until the process changes your new number into itself.

Your new number is

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