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: ['1499', '2849', '245', '233', 'L', 'x', 'B', '7811', '8151', '4143', 'e', 'G', '8395', 't', 'Y', 's', '3491', 'r', 'Y', 'x', 'p', 'p', 'e', '1067', 'f', 'H', 't', '9787', '8031', '4243', 'X', 'w', 'A', '7547', 'e', '4489', 'n', 'F']

1499, 2849, 245, 233, 12, 24, 2, 7811, 8151, 4143, 5, 7, 8395, 20, 25, 19, 3491, 18, 25, 24, 16, 16, 5, 1067, 6, 8, 20, 9787, 8031, 4243, 24, 23, 1, 7547, 5, 4489, 14, 6