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: ['7671', '6805', '5569', 'M', 'W', '8219', '3057', '9945', 'W', 'y', '1955', 'U', '7971', 'S', '1467', '7973', 'N', 'h', 'P', 'D', 'j', '6819', '403', '1637', '133', 'X', 'H', 'n', 'U', 'o', '5111', 'x', 'L', '6681', 'E', 'D']

7671, 6805, 5569, 13, 23, 8219, 3057, 9945, 23, 25, 1955, 21, 7971, 19, 1467, 7973, 14, 8, 16, 4, 10, 6819, 403, 1637, 133, 24, 8, 14, 21, 15, 5111, 24, 12, 6681, 5, 4