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', 'Z', '9787', '2757', '3835', 'v', '4219', '8603', '8203', 'X', 'O', '3093', '3531']

17, 26, 9787, 2757, 3835, 22, 4219, 8603, 8203, 24, 15, 3093, 3531