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: ['r', 'O', '6293', 'B', '7673', 'C', '6819', '1139', '4683', '7547', 'J', 'w', 'V', 'r', 'D', 'l', '8841', 'C', '4965', 'E', '5039', 'G', '1831', '1337', 'B', 'D', 'J', '4377']

18, 15, 6293, 2, 7673, 3, 6819, 1139, 4683, 7547, 10, 23, 22, 18, 4, 12, 8841, 3, 4965, 5, 5039, 7, 1831, 1337, 2, 4, 10, 4377