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: ['P', '2993', 'w', '33', '1419', '263', '3423', '2905', 'B', 'm', 'l', 'K', 'Y', 'g', '2521', '2031', 'I', '2103', '9815', '1769', 'P', 'p', 'Q', '6521', '4979', '5075', 'r']

16, 2993, 23, 33, 1419, 263, 3423, 2905, 2, 13, 12, 11, 25, 7, 2521, 2031, 9, 2103, 9815, 1769, 16, 16, 17, 6521, 4979, 5075, 18