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: ['2187', '5989', 'u', '787', 'e', '1203', 'd', 'I', '4265', 'q', 'S', '1217', 'D', '6075', 'X', '7267', 'G', '5127', '7853', '9847', '8815', '9797', '9619', 'H', 'Z', 'x', 'W', 'd', '3377', 'G', '2441', 'i', 'l']

2187, 5989, 21, 787, 5, 1203, 4, 9, 4265, 17, 19, 1217, 4, 6075, 24, 7267, 7, 5127, 7853, 9847, 8815, 9797, 9619, 8, 26, 24, 23, 4, 3377, 7, 2441, 9, 12