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: ['7001', 'n', '909', '2983', 'H', '6317', '1407', 'A']

7001, 14, 909, 2983, 8, 6317, 1407, 1