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: ['3263', '785', 'J', 'a', '2909', '2443', 'I', '7465', '7629', 'z', '6669', 'r', 'Z', 'i', '509', '3965', 'c', 'm', 'm', 'O', 'y', '7913', '1859', '7805', 'a', 'm', 'M', 'o', '1145', 'o', '7281', '4277']

3263, 785, 10, 1, 2909, 2443, 9, 7465, 7629, 26, 6669, 18, 26, 9, 509, 3965, 3, 13, 13, 15, 25, 7913, 1859, 7805, 1, 13, 13, 15, 1145, 15, 7281, 4277