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: ['T', '875', 'Q', 'y', 'h', '9861', '7517', '2705', '8803', 'R', '5127', 'u', '8405', 'J']

20, 875, 17, 25, 8, 9861, 7517, 2705, 8803, 18, 5127, 21, 8405, 10