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: ['5639', '3685', '9333', 'H', 'b', 'Z', 'e', '9979', '5591', 'G', 'A', '2855', '6507', '7603', '2407', '2231', '8729', '847', 'e', '5285', 'T']

5639, 3685, 9333, 8, 2, 26, 5, 9979, 5591, 7, 1, 2855, 6507, 7603, 2407, 2231, 8729, 847, 5, 5285, 20