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: ['8377', 'b', 's', '257', '9005', 'u', 'w', '2839', 'l', '2147', '2105', '4765', '9255']

8377, 2, 19, 257, 9005, 21, 23, 2839, 12, 2147, 2105, 4765, 9255