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: ['5015', 'e', '9559', 'R', 'Q', 'D', 'k', '6045', '5043', 'A', '7865', 'i', 'y', 'i', 'P', 'V', 'r', '3661', '5053', 'r', 'o', '7421']

5015, 5, 9559, 18, 17, 4, 11, 6045, 5043, 1, 7865, 9, 25, 9, 16, 22, 18, 3661, 5053, 18, 15, 7421