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: ['3817', '4965', 'o', 'D', 'E', '5351', '7239', 's', 'V', '5235', 'a', 'B', 'b', '7329', '7533']

3817, 4965, 15, 4, 5, 5351, 7239, 19, 22, 5235, 1, 2, 2, 7329, 7533