Keyboard input from an integer n (1 <n <= 9), between three different numbers to use a three-digit number composed of 0 to n, the number of such statistical programming several consensus.

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Keyboard input from an integer n (1 <n <= 9), between three different numbers to use a three-digit number composed of 0 to n, the number of such statistical programming several consensus.

(Python) Write a program that inputs a three-digit positive integer from the keyboard, and then outputs the corresponding number in reverse, and outputs -1 if the input number is not a three-digit positive integer.

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