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: ['Q', '2683', 'z', 'x', 'r', 'p', '669', '1261', 'O', '2175', '6487', '4443', 'X', '8981', 'L', '9409', '5777', '2539', 'D', '1745', '769', 'H', '1227', 'i', '2295', '689', '7817', '2535', 'A', '7', 'D', 'o', 'S', '6771', '7769']

17, 2683, 26, 24, 18, 16, 669, 1261, 15, 2175, 6487, 4443, 24, 8981, 12, 9409, 5777, 2539, 4, 1745, 769, 8, 1227, 9, 2295, 689, 7817, 2535, 1, 7, 4, 15, 19, 6771, 7769