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: ['m', '4303', 'm', 'E', 'm', '8443', '4825', 'a', 'm', '9709', '9083', 'E', 'c', '5721', 'W', '2995', 'l', 'X', 'S', 'p', '4379', 'F', 'N', '9509']

13, 4303, 13, 5, 13, 8443, 4825, 1, 13, 9709, 9083, 5, 3, 5721, 23, 2995, 12, 24, 19, 16, 4379, 6, 14, 9509