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: ['Z', '2651', 'e', 'l', '4787', 'Q', 'A', 'u', '991', 'K', '4295', '3', '8907', 'K', '1381', 'G', 'g']

26, 2651, 5, 12, 4787, 17, 1, 21, 991, 11, 4295, 3, 8907, 11, 1381, 7, 7