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: ['o', '2759', '8597', 'w', 'i', '461', '9759', '5795', '309', '8073', 'N', 'c']

15, 2759, 8597, 23, 9, 461, 9759, 5795, 309, 8073, 14, 3