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: ['N', '6605', '7581', 'a', 'M', 'v', 'l', 'b', 'q', 'R', 'e', 'i', 'a', '4469', 'D', 'H', 'T', '4561', '2973', 'a', 'H', 'N', '7097', '7097', '3427', '6013', 'R', 'R', 'e', '7571', 'P', 'b', 'L', '6915', '3541']

14, 6605, 7581, 1, 13, 22, 12, 2, 17, 18, 5, 9, 1, 4469, 4, 8, 20, 4561, 2973, 1, 8, 14, 7097, 7097, 3427, 6013, 18, 18, 5, 7571, 16, 2, 12, 6915, 3541