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: ['M', '6527', 'M', 's', '9899', '4033', 'L', 'y', '2209', '977', 'J', 'o', '1421', 'D', '3323', 'a', '8067', 'd', 'p', '3011', '5025', 'a', 'B', '9603', '4881', '8147']

13, 6527, 13, 19, 9899, 4033, 12, 25, 2209, 977, 10, 15, 1421, 4, 3323, 1, 8067, 4, 16, 3011, 5025, 1, 2, 9603, 4881, 8147