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: ['E', 'k', '8647', '6767', 't', 'E', '7481', '173', 'e', 'X', '481', 'r', '8903', 'F', '8713', 'x', '3401', '8883', '1321', '6311', '1937', 'B']

5, 11, 8647, 6767, 20, 5, 7481, 173, 5, 24, 481, 18, 8903, 6, 8713, 24, 3401, 8883, 1321, 6311, 1937, 2