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: ['M', 'd', '6519', '4915', '9819', '1', 'd', '8079']

13, 4, 6519, 4915, 9819, 1, 4, 8079