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: ['O', 'l', '7417', 'F', 'y', '1633', 'B', '3319', 'M', 'c', 'A', 'm', 'd', 'C', 'L', 'M', 'S', 'w', 'J', 'L', 't', 'F', 'L', 'h', 'M', '8643', 'o', 'K', 'x', 'k', 'q', 'h', '1385', 'L', '3331', 'U', 'P', '9315', 'n', '3903']

15, 12, 7417, 6, 25, 1633, 2, 3319, 13, 3, 1, 13, 4, 3, 12, 13, 19, 23, 10, 12, 20, 6, 12, 8, 13, 8643, 15, 11, 24, 11, 17, 8, 1385, 12, 3331, 21, 16, 9315, 14, 3903