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: ['4247', 'T', 'v', '5905', 'K', '6873', 'J', '9237', 'r', '5671', 'H', '1091', 'f', '6917', 'q', '5925', 'y', '829', 'y', '6701', 'E', '7059', '8595', 'L', 'c', '8257', 'Y', '1533', '3015', '4415']

4247, 20, 22, 5905, 11, 6873, 10, 9237, 18, 5671, 8, 1091, 6, 6917, 17, 5925, 25, 829, 25, 6701, 5, 7059, 8595, 12, 3, 8257, 25, 1533, 3015, 4415