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: ['5875', 'C', '521', '4871', '7673', '8837', 'i', 'w', 'K', '6697']

5875, 3, 521, 4871, 7673, 8837, 9, 23, 11, 6697