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: ['H', '8411', '757', 's', 'A', '343', 'v', '7939', 'V', 'k', '1407', 'r', '3087', 'n', '2839', '5719', '7115', '4275', 'U', '7991', '1863', 'L', '3733', '8319', '177', 'e', '1957', '1669', 'k']

8, 8411, 757, 19, 1, 343, 22, 7939, 22, 11, 1407, 18, 3087, 14, 2839, 5719, 7115, 4275, 21, 7991, 1863, 12, 3733, 8319, 177, 5, 1957, 1669, 11