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: ['Q', '371', '2539', 'X', '5367', 'L', '4029', '7809']

17, 371, 2539, 24, 5367, 12, 4029, 7809