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: ['7963', 'd', 'm', '6813', 'S', '8015', '8351', '6639', '417', 'T', 'o', '9985', 'k', 'S', '5495', 'I', '6273', '5411', '3833', 'q']

7963, 4, 13, 6813, 19, 8015, 8351, 6639, 417, 20, 15, 9985, 11, 19, 5495, 9, 6273, 5411, 3833, 17