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: ['9251', 'a', '2509', 'd', '761', '8513', 'o', 'H', 'T', 'Z', '5387', 'X', '5181', '4349', '4273', 'n', 'p', '977', 'E', 'E', '1809', 'i', 'f', 'h', '4821', '1799', 'b', '4031', 'x', 'x', 'd', 'T', 'c', 'z', 'X', '3161', '7067']

9251, 1, 2509, 4, 761, 8513, 15, 8, 20, 26, 5387, 24, 5181, 4349, 4273, 14, 16, 977, 5, 5, 1809, 9, 6, 8, 4821, 1799, 2, 4031, 24, 24, 4, 20, 3, 26, 24, 3161, 7067