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: ['U', '8185', '295', 'p', '4913', '4565', 'M', '721', 'C', 'Q', '2607', 'w', '1631', '8259', 'j']

21, 8185, 295, 16, 4913, 4565, 13, 721, 3, 17, 2607, 23, 1631, 8259, 10