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: ['l', '7535', 'q', '7867', 'E', '9107', 'w', '3431', '1673', 'E', 'z', 'k', 'h', 'E', '2713', '7359', '6017', '1279', 'G', 'p', '8227', '5225', 'H', 'C', '231', 'K', 'i', 'm', '2509']

12, 7535, 17, 7867, 5, 9107, 23, 3431, 1673, 5, 26, 11, 8, 5, 2713, 7359, 6017, 1279, 7, 16, 8227, 5225, 8, 3, 231, 11, 9, 13, 2509