An ISBN-10 (International Standard Book Number) consists of 10 digits: The last digit, is a checksum, which is calculated from the other nine digits using the following formula:   (d1 x 1 + d2 x 2 + d3 x 3 + d4 x 4 + d5 x 5 + d6 x 6 + d7 x 7 + d8 x 8 + d9 x 9) % 11) If the checksum is 10, the last digit is denoted as X, according to the ISBN convention. Write a program that prompts the user to enter the first 9 digits as a string and displays the 10-digit ISBN (including leading zeros). Your program should read the input as a string.

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