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: ['5549', '6407', '2835', 'v', 'P', '1663', '8977', 'K', 'o', 'j', 'h', 't', '9829', 'L', 'j', 'j', 't', '8629', '497', 'U', '145', '1459', 'n']

5549, 6407, 2835, 22, 16, 1663, 8977, 11, 15, 10, 8, 20, 9829, 12, 10, 10, 20, 8629, 497, 21, 145, 1459, 14