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: ['3663', 'w', '1871', '1209', 'H', '5453', 'A', 'L', '6963', 'K', '6253', 'h', '6013', '49', '7737', '6771', 'j', '8721', '1657', 'j', 'E', '5069', '5465', 'c', 'n', 'i', 'U', 'C']

3663, 23, 1871, 1209, 8, 5453, 1, 12, 6963, 11, 6253, 8, 6013, 49, 7737, 6771, 10, 8721, 1657, 10, 5, 5069, 5465, 3, 14, 9, 21, 3