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: ['1381', '2531', 'G', 'k', 'a', 'E', 'r', '6139', 'o', 'T', 'p', '1881', '2765', 'm', 'u', '6543', '8069', 'I', 'M', '9657', '8093', '7589', 'Y', 'B', '8673']

1381, 2531, 7, 11, 1, 5, 18, 6139, 15, 20, 16, 1881, 2765, 13, 21, 6543, 8069, 9, 13, 9657, 8093, 7589, 25, 2, 8673