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: ['Y', '91', '2149', '5699', 'X', '2769', '3743', 'b', '7581', 'k', '4269', 'a', '7925', 'A', 'd', 'Q', 'X', 'a', '3853', '4107', 'Y', 'q', 'u', '3093', 'o', 'C', 'f', '3581', '4309', '4417', 'X', '3921', 'w', '3789', 'A', 'K']

25, 91, 2149, 5699, 24, 2769, 3743, 2, 7581, 11, 4269, 1, 7925, 1, 4, 17, 24, 1, 3853, 4107, 25, 17, 21, 3093, 15, 3, 6, 3581, 4309, 4417, 24, 3921, 23, 3789, 1, 11