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: ['4621', 'N', 'k', '6089', '6265', 'h', 'F', '7715', '6971', '153', 'N', '9287', 'N', 'p', 'P', '787', '4905', '4057', '5005', 'K', 'k', 'o', '9913', '9103', '9883', 'N', 'L']

4621, 14, 11, 6089, 6265, 8, 6, 7715, 6971, 153, 14, 9287, 14, 16, 16, 787, 4905, 4057, 5005, 11, 11, 15, 9913, 9103, 9883, 14, 12