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: ['5539', 'T', '1949', 'C', '2643', 'c', 'q', '459', '119', 'b', 'c', 'V', 'k', '5885', '7221', '4039', 'B', 'w', '7945', '7393', '9485', '3213', '4789', '4647', 'S', '8883', 'g', 'B', 'V', 'S', 'l', 'r', '2735']

5539, 20, 1949, 3, 2643, 3, 17, 459, 119, 2, 3, 22, 11, 5885, 7221, 4039, 2, 23, 7945, 7393, 9485, 3213, 4789, 4647, 19, 8883, 7, 2, 22, 19, 12, 18, 2735