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: ['9075', '8363', '1481', 'o', '1703', '937', '5713', 'y', 'X', 'h', 'L', 'V', '1987', 'o', 'Z', '31', '6105', 'p', '8729', '3321', '5655', '6729', 'x']

9075, 8363, 1481, 15, 1703, 937, 5713, 25, 24, 8, 12, 22, 1987, 15, 26, 31, 6105, 16, 8729, 3321, 5655, 6729, 24