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: ['O', 'b', 'h', 'E', '7997', 't', '2815', '1081', '3849', 'R', 'd', '2877', '2845', 'F', '4171', 'n', 'I', 'W', 'A', 'J', '7097', '2605', 'J', 'p', 'M', 'k', 'a', 'q', '1359', '3487', 'L', '115', '6115']

15, 2, 8, 5, 7997, 20, 2815, 1081, 3849, 18, 4, 2877, 2845, 6, 4171, 14, 9, 23, 1, 10, 7097, 2605, 10, 16, 13, 11, 1, 17, 1359, 3487, 12, 115, 6115