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: ['9957', 'n', 'K', 'R', 'V', '9279', 'N', 'A', '3499']

9957, 14, 11, 18, 22, 9279, 14, 1, 3499