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: ['333', '7483', 'l', 'x', 'R', 'r', 's', 'B', 'r', '5873', 'W', 'K', '929', '8929', 'V', 'f', '1113', 'm', 'Q', 'B', 'x', 'b', '5317', 'S', '907', 'S']

333, 7483, 12, 24, 18, 18, 19, 2, 18, 5873, 23, 11, 929, 8929, 22, 6, 1113, 13, 17, 2, 24, 2, 5317, 19, 907, 19