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: ['9581', '1979', 'I', 'B', '7039', 'X', '6089', 'f', '2177', '5993', 'u', 'W', '9985', 'b', '8161', '111', 'k', '4457', '1135', '7003', 'R', 'a', '3219']

9581, 1979, 9, 2, 7039, 24, 6089, 6, 2177, 5993, 21, 23, 9985, 2, 8161, 111, 11, 4457, 1135, 7003, 18, 1, 3219