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: ['k', '1487', 'y', '1147', '3993', 'B', 'l', '8421', 'v', 'W', '5873', '219', '4025', '5209', '3037', 'B', '233', '9869', 'H', '3747', 'k', 'V', 'D', '5669', '8499', '8675', 'J', 'J', '9875', 'H', 'K', '5975', 'C']

11, 1487, 25, 1147, 3993, 2, 12, 8421, 22, 23, 5873, 219, 4025, 5209, 3037, 2, 233, 9869, 8, 3747, 11, 22, 4, 5669, 8499, 8675, 10, 10, 9875, 8, 11, 5975, 3