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: ['b', '4563', '4891', '6099', 'w', '8503', '4391', 'p', 'Q', '1403', 'B', 'k', '6855', 'b', 's', '6693', 'd', '3661']

2, 4563, 4891, 6099, 23, 8503, 4391, 16, 17, 1403, 2, 11, 6855, 2, 19, 6693, 4, 3661