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: ['4305', 'Q', 'R', 'm', '8275', '6967', 'Y', '9469', 'a', 'w', '3261', '8655', 'l', 'g', '3403', 'u', '8457', '2951', '2163', '2751', '4599', 'R']

4305, 17, 18, 13, 8275, 6967, 25, 9469, 1, 23, 3261, 8655, 12, 7, 3403, 21, 8457, 2951, 2163, 2751, 4599, 18