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: ['147', '8269', 'W', 'x', 'G', '8237', 'v', 'I', 'f', '2629', 'W', '5717', '5917', '3927', 'T', '9309', '8569', '8927', 'w', '4511', '5115', 'R', 'l', '3345', '5309', 'L', 'D', '1215', 'x', 'Y', '9051', 'F', '761', 'y', '9771', 'M']

147, 8269, 23, 24, 7, 8237, 22, 9, 6, 2629, 23, 5717, 5917, 3927, 20, 9309, 8569, 8927, 23, 4511, 5115, 18, 12, 3345, 5309, 12, 4, 1215, 24, 25, 9051, 6, 761, 25, 9771, 13