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To a three-digit integer A, in which the hundreds digit differs from the tens digit, apply the following operation:

OPERATION
| The difference between the hundreds digit and tens digit of A becomes the digit in the hundreds place of a new three-digit integer, the difference between the tens digit and the ones digit of A becomes the digit in the tens place, and the difference between the hundreds digit and the ones digit of A becomes the digit in the ones place. |

⟦A⟧ is the notation for this operation.

For example, ⟦305⟧ = 352, ⟦737⟧ = 440.

There is only one integer A that meets all of the following conditions ①,② and ③. Determine integer A.

① A is less than ⟦A⟧.

② The difference between the hundreds digit of A and the hundreds digit of ⟦A⟧ is 1.

③ The difference between A and ⟦A⟧ is a one-digit integer.

For example, ⟦305⟧ = 352, ⟦737⟧ = 440.

There is only one integer A that meets all of the following conditions ①,② and ③. Determine integer A.

① A is less than ⟦A⟧.

② The difference between the hundreds digit of A and the hundreds digit of ⟦A⟧ is 1.

③ The difference between A and ⟦A⟧ is a one-digit integer.

(from Twitter)