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: ['4241', '1289', 'e', 'f', '2637', '205', '1455', '9005', '4605', 'G', '3851', '7547', '4753', '2343', 'I', '9237', '725', '3541', 'j', 'X', 'E', '1305', '2713', 'N', '751', '2987', 'A', 'M', 'p', 'U', 'c', 'T', '9565', 'U', '3931', '1165', '8967', 'Y']

4241, 1289, 5, 6, 2637, 205, 1455, 9005, 4605, 7, 3851, 7547, 4753, 2343, 9, 9237, 725, 3541, 10, 24, 5, 1305, 2713, 14, 751, 2987, 1, 13, 16, 21, 3, 20, 9565, 21, 3931, 1165, 8967, 25