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: ['P', '1043', '4053', '1375', '9739', 'M', 's', '7949', '3373', 'O', '3081', 'h', '8059', '8363', 'K', '1627', '3133', 'c', 'O', 'T', '7149', 'k', '9693', '7769', '5469', '2603', 'I', 'J', 'R']

16, 1043, 4053, 1375, 9739, 13, 19, 7949, 3373, 15, 3081, 8, 8059, 8363, 11, 1627, 3133, 3, 15, 20, 7149, 11, 9693, 7769, 5469, 2603, 9, 10, 18