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: ['5039', '8917', '4637', 'y', '1343', '7903', 'Z', '1561', '7719', '3603', '2547', '1819', '6021', '7543', '3697', 'y', 'x', 'Y', 'm', 'Q', 'W', '5895', '4449']

5039, 8917, 4637, 25, 1343, 7903, 26, 1561, 7719, 3603, 2547, 1819, 6021, 7543, 3697, 25, 24, 25, 13, 17, 23, 5895, 4449