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: ['L', 'P', 'M', 'X', 'Y', 'G', 'q', '3007', 'T', 'A', 'C', '263', 'a', '2949']

12, 16, 13, 24, 25, 7, 17, 3007, 20, 1, 3, 263, 1, 2949