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: ['581', 'b', '7481', 'e', '3821', 't', '1191', '6055']

581, 2, 7481, 5, 3821, 20, 1191, 6055