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: ['m', 'Q', 'U', 'D', '9407', 'p', 'X', '9975', '5071', 'Y', '4801', 'A', 'J', '2711', '2959', 'Z', 'R', '7749', '8635', '7141', 'p', 'x', 'K', 'B', '2733', '2513', 'k', 'B', 'j', '6463', '1651', '8955', 'X']

13, 17, 21, 4, 9407, 16, 24, 9975, 5071, 25, 4801, 1, 10, 2711, 2959, 26, 18, 7749, 8635, 7141, 16, 24, 11, 2, 2733, 2513, 11, 2, 10, 6463, 1651, 8955, 24