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', '5249', 'W', '2189', 'F', 'N', '801', '6123', '1235']

15, 5249, 23, 2189, 6, 14, 801, 6123, 1235