Choose a three-digit number so that the first and third digits differ two or more units:

- Write the number from right to left;
- Do the subtraction of the larger number by the smaller;
- Write the number obtained in point 2 from right to left and add it to the number also obtained in point 2.

And the result is \(1089\).

Example: Consider the number \(503\).

- \(305\)
- \(503-305=198\)
- \(198+981=1089\)

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