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: ['2975', 'F', '4539', '1671', 'I', 'C', '7135', 'a', 'H', 'd', 't', '4211', '5737', 'm', 'g', '5151', '951', 'J', 'D', 't', '8303', '5085', '6401', '359', '771', 'I', '4501', '867', 'W', '8585', 't', '9019', '1081', 'c', 'W', 'w', '1635']

2975, 6, 4539, 1671, 9, 3, 7135, 1, 8, 4, 20, 4211, 5737, 13, 7, 5151, 951, 10, 4, 20, 8303, 5085, 6401, 359, 771, 9, 4501, 867, 23, 8585, 20, 9019, 1081, 3, 23, 23, 1635