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: ['I', 'l', 'Y', '3513', 'A', 'd', '4697', 'D', 'w', '7493', 'w', 'l', '9087', '8787', '3467', '7777', '2061', '1197', '369', 't', 'l', '6211', '1363', 'O', '7695', 'R', '7469', 'X', '9513', '1531', 'b', '931', '77', 't', 'b', 'W', '5849']

9, 12, 25, 3513, 1, 4, 4697, 4, 23, 7493, 23, 12, 9087, 8787, 3467, 7777, 2061, 1197, 369, 20, 12, 6211, 1363, 15, 7695, 18, 7469, 24, 9513, 1531, 2, 931, 77, 20, 2, 23, 5849