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: ['t', 'Y', 'x', '5593', 'a', '8549', '2353', '3103', '8887', 'b', 'o', 'd', '2073', 'G', 'L', 'W', '2887', 'X', '2137', 'y', '1365', '6989', '475', '6817', '5025', 'm', '3147']

20, 25, 24, 5593, 1, 8549, 2353, 3103, 8887, 2, 15, 4, 2073, 7, 12, 23, 2887, 24, 2137, 25, 1365, 6989, 475, 6817, 5025, 13, 3147