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: ['d', '4667', '2423', '243', '2673', '3451', 'Y', '2733', '5731', 'K', 'Z', '743', 'l', '1487']

4, 4667, 2423, 243, 2673, 3451, 25, 2733, 5731, 11, 26, 743, 12, 1487