Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['1073', '6915', '2347', 'x', '5903', '8993', '1721', '8221', 'O', '2889', 'o', '7179', 'e', '1877', '4851', '9749', 'K', '9297', '5309', 'A', '2829', '4915', '1501']

1073, 6915, 2347, 24, 5903, 8993, 1721, 8221, 15, 2889, 15, 7179, 5, 1877, 4851, 9749, 11, 9297, 5309, 1, 2829, 4915, 1501