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: ['l', '3261', '4951', '3287', 'i', 'I', '393', 'T', '8691', '4227', 'w', '1503', '5177', 'k', 'B', 'G']

12, 3261, 4951, 3287, 9, 9, 393, 20, 8691, 4227, 23, 1503, 5177, 11, 2, 7