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: ['m', '9297', 'c', 'A', 'O', '389', '7319', '3615', '7645', '6265']

13, 9297, 3, 1, 15, 389, 7319, 3615, 7645, 6265