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: ['2709', '5137', 'B', 'F', 'T', '8829', '7125', 'T', '1517', '1031', 'p', 'J', 'B', '1293', '2241', 'S', '3285', 'q', 'n']

2709, 5137, 2, 6, 20, 8829, 7125, 20, 1517, 1031, 16, 10, 2, 1293, 2241, 19, 3285, 17, 14