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: ['9449', 'Y', '2021', '9385', '623', '8749', 'G', '27', '4205', '4059', 'f', '6741', 'C']

9449, 25, 2021, 9385, 623, 8749, 7, 27, 4205, 4059, 6, 6741, 3