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: ['J', 'p', 'i', 'K', '1817', '937', 'r', '3821', '6589', '2543', 'D', 'O', 'R', '8877', 'J']

10, 16, 9, 11, 1817, 937, 18, 3821, 6589, 2543, 4, 15, 18, 8877, 10