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', 'o', 'S', 'G', '3543', 'F', 'Z', 'o', '6055', 'R', '363', '2139', '6371', '4107', 'G', 'W', '3261', '4301', '1075', 'q', '7015', 'p']

16, 15, 19, 7, 3543, 6, 26, 15, 6055, 18, 363, 2139, 6371, 4107, 7, 23, 3261, 4301, 1075, 17, 7015, 16