Phone number
Ivan's phone number ends with a four-digit number: When we subtract the first from the fourth digit of this four-digit number, we get the same number as when we subtract the second from the third digit. If we write the four-digit number from the back and subtract the original, we get the result of 5445. The sum of these four numbers is 12, and the first digit is not 0. What four-number does Ivan's number end?
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