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: ['Q', '8819', '3931', '459', 'X', 'd', 'i', 'x', 'Q', '3229', '3495', 'h', '5271', 'd', '3669', 'r', '4971', '2775', 'e']

17, 8819, 3931, 459, 24, 4, 9, 24, 17, 3229, 3495, 8, 5271, 4, 3669, 18, 4971, 2775, 5