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: ['i', 'R', 'W', '3845', 'j', 'U', '5657', 'T', 'B', 'H', 'X', '3709', '1841', 'B', 'n', 'c', '5945', 'D', '761', '4933', 'i', '6525', '1811', 'D', 'Q', '3927', '1633', '6243', '8869', 'l', '4747', '1389', '7727', '1485', '6773']

9, 18, 23, 3845, 10, 21, 5657, 20, 2, 8, 24, 3709, 1841, 2, 14, 3, 5945, 4, 761, 4933, 9, 6525, 1811, 4, 17, 3927, 1633, 6243, 8869, 12, 4747, 1389, 7727, 1485, 6773