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: ['2503', 'm', 'B', 'j', '7131', '5277', '2481', '1449', '4907', '5243', '989', 'F', '3501', 'w', 'G', '9501', '5721', 'e', 'K', 'S', '5527', '7465', '6051', '7275', 'Y', '8717', 'm', 'Z', '8391', '9231', '1059', 'I', '4767', '7791', '1611', 'P', 'J', 'F']

2503, 13, 2, 10, 7131, 5277, 2481, 1449, 4907, 5243, 989, 6, 3501, 23, 7, 9501, 5721, 5, 11, 19, 5527, 7465, 6051, 7275, 25, 8717, 13, 26, 8391, 9231, 1059, 9, 4767, 7791, 1611, 16, 10, 6