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: ['3339', '3807', 's', '4965', '5197', '4589', '4707', '5525', '1439', 'T', 'V', '6195']

3339, 3807, 19, 4965, 5197, 4589, 4707, 5525, 1439, 20, 22, 6195