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', 'l', '4351', '6871', '5761', 'A', '6727', '5321', 'E', 'v', 'r', '5055', '2441', '2985', 'Y', '8783', '9083', '8715', 'X', 'o', '4115', '6239', 'K']

11, 12, 4351, 6871, 5761, 1, 6727, 5321, 5, 22, 18, 5055, 2441, 2985, 25, 8783, 9083, 8715, 24, 15, 4115, 6239, 11