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', 'Y', 'p', '8749', '1653', 'f', 'm', '3677', 'w', '8117', 'X', 'Q', '2921', '6637', '9181']

25, 25, 16, 8749, 1653, 6, 13, 3677, 23, 8117, 24, 17, 2921, 6637, 9181