Please input a number (or just press ENTER to exit): Got valid number 1.
Please input a number (or just press ENTER to exit): There is some trash after the number 123.
Please input a number (or just press ENTER to exit): This does not look like a number.
Please input a number (or just press ENTER to exit): Got valid number 100500.
Please input a number (or just press ENTER to exit): Got valid number 2147483647, but it was too big.
Please input a number (or just press ENTER to exit): Exiting...