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', '2523', 'b', '4683', 'X', '5651', 'R', '5169', '8709', 'm', 'E', 'X', 'r', 'B', '9365', 'r', 'p', '4251', 'L', 'i', '4973', '3293', '877']

10, 2523, 2, 4683, 24, 5651, 18, 5169, 8709, 13, 5, 24, 18, 2, 9365, 18, 16, 4251, 12, 9, 4973, 3293, 877