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: ['X', '7969', 'E', 'Y', '7257', 'z', 'Z', 'q', 'Y', 's', 'l', 'g', '3653', '5329', 's', 'Y', '7417', '8547', 'v', '9843', 'B', 'u', '8415', '5067', '9285', '953', '3987', '3575']

24, 7969, 5, 25, 7257, 26, 26, 17, 25, 19, 12, 7, 3653, 5329, 19, 25, 7417, 8547, 22, 9843, 2, 21, 8415, 5067, 9285, 953, 3987, 3575