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: ['c', 'J', 'I', '5885', '6487', 'Z', '551', '3555', 'R', '1845', 'S', '4893', 'p', '8735', '8761', '7497', 'g', 'M', 'c']

3, 10, 9, 5885, 6487, 26, 551, 3555, 18, 1845, 19, 4893, 16, 8735, 8761, 7497, 7, 13, 3