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: ['1531', '833', 'q', '8469', 'v', 'P', '7279', '5269', 'C', '1471', 'o', 'h', 'X', '9879', 'R', '5667', 'R', 'e', 'x', 'e', 'a', 'D', 'S', '5039', 'l', 'U', 'd', 'C', 'h', 'Y', 'q', 'u', 'X', 'J', 'R', '1753', '8329']

1531, 833, 17, 8469, 22, 16, 7279, 5269, 3, 1471, 15, 8, 24, 9879, 18, 5667, 18, 5, 24, 5, 1, 4, 19, 5039, 12, 21, 4, 3, 8, 25, 17, 21, 24, 10, 18, 1753, 8329