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: ['h', 'y', 'r', '3221', 's', '5553', 'K', '7265', '1971', '6771', 'G', 't', 's', 'U', '5065', '409', '3815', 'r', '6499', '3375', 'C', 'g', '5821', '8395', '9309', 'G', '5669', 'o', 'v', 'B', 'z', '2539', '9461', 'z', '1035']

8, 25, 18, 3221, 19, 5553, 11, 7265, 1971, 6771, 7, 20, 19, 21, 5065, 409, 3815, 18, 6499, 3375, 3, 7, 5821, 8395, 9309, 7, 5669, 15, 22, 2, 26, 2539, 9461, 26, 1035