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: ['9489', 'T', '6735', 'Y', '6521', 'w', 'y', 'y', '5761', 'l', 'o', '2727', 'i', '901', 'r', 'j', '4753', '2315', '7093', '5029', '6797', '1941', '9127', '5663', '343', '9673', 'O', '5137', 's', '8205', 'o']

9489, 20, 6735, 25, 6521, 23, 25, 25, 5761, 12, 15, 2727, 9, 901, 18, 10, 4753, 2315, 7093, 5029, 6797, 1941, 9127, 5663, 343, 9673, 15, 5137, 19, 8205, 15