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: ['739', 'i', '9987', 'N', '7649', 'a', 'Q', '4143', '8091', '9845', '2401', '1977', '2947', '7073', 'k', '8219', 'J', 'q', '5903', '2333', '7241', '3157', 'B', 'S', '8357', 'F', 't', '229']

739, 9, 9987, 14, 7649, 1, 17, 4143, 8091, 9845, 2401, 1977, 2947, 7073, 11, 8219, 10, 17, 5903, 2333, 7241, 3157, 2, 19, 8357, 6, 20, 229