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: ['3927', 'g', 'D', 'Q', '4957', 'f', '1091', '3335', '5909', '8457', '3007', '1249']

3927, 7, 4, 17, 4957, 6, 1091, 3335, 5909, 8457, 3007, 1249