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: ['h', 'f', '4821', 'k', '7695', '4839', 'z', '5459', 'm', '7019', 'E', 'b', 'r', 'Y', '4859', '861', '5549', '2587', 'R', '631', '559', '9413', '111', '5611', '8967', '7789', 'c', 'a', '657', 'O', '119']

8, 6, 4821, 11, 7695, 4839, 26, 5459, 13, 7019, 5, 2, 18, 25, 4859, 861, 5549, 2587, 18, 631, 559, 9413, 111, 5611, 8967, 7789, 3, 1, 657, 15, 119