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: ['5209', 'd', 'T', 's', '9107', '2647', '6339', '391', '5071', 'e', 'E', 'n', '149', 'h', 'f', 'q', '9049', 'r', 'O', '5971', 'Z', '2557', 'q', '465']

5209, 4, 20, 19, 9107, 2647, 6339, 391, 5071, 5, 5, 14, 149, 8, 6, 17, 9049, 18, 15, 5971, 26, 2557, 17, 465