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: ['l', '3119', 'e', '2637', '9281', '469', '8245', '5489', 'D', '3673', '7649', '3475', '9531', '1931', '5779', 'p', '9823', 'V', '3363', 'i', '2189', 'J', 'b', '3063', '6011', '243', '3071', '3221', 'N', '1357', 'e', 'X', '6159']

12, 3119, 5, 2637, 9281, 469, 8245, 5489, 4, 3673, 7649, 3475, 9531, 1931, 5779, 16, 9823, 22, 3363, 9, 2189, 10, 2, 3063, 6011, 243, 3071, 3221, 14, 1357, 5, 24, 6159