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: ['4439', '1429', 'v', '1407', '2513', 'K', 'Y', '3087', '2349', 'u', '6015', 'w', '4933', 'U', '297', 'w', 'G', 'm', 'e', 'D', 'Z', 'j', '5363', 'U']

4439, 1429, 22, 1407, 2513, 11, 25, 3087, 2349, 21, 6015, 23, 4933, 21, 297, 23, 7, 13, 5, 4, 26, 10, 5363, 21