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: ['I', '1485', 'r', '6025', '5815', '1849', 'H', 'G', '4303', 'y', 'F', '8701', '5573']

9, 1485, 18, 6025, 5815, 1849, 8, 7, 4303, 25, 6, 8701, 5573