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: ['p', '7809', '6623', '2483', 'n', '4211', 'Q', '799', 'H']

16, 7809, 6623, 2483, 14, 4211, 17, 799, 8