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: ['j', 'u', '89', 'Q', '5067', '9523', '2291', 'm', '6057', 'P', '9537', 'S', '5291', '1403']

10, 21, 89, 17, 5067, 9523, 2291, 13, 6057, 16, 9537, 19, 5291, 1403