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: ['o', 'H', '1239', 'm', '6769', 'z', '9467', 'x', 'M', '1639', '1951', '6701', 'D', '8215', 's', '6273', 'X', 'z', '633', '8283', 'F', 'q', 'T', '7185', 'R']

15, 8, 1239, 13, 6769, 26, 9467, 24, 13, 1639, 1951, 6701, 4, 8215, 19, 6273, 24, 26, 633, 8283, 6, 17, 20, 7185, 18