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', 'v', 'J', '6205', '5199', 'B', '3091', '1099']

20, 22, 10, 6205, 5199, 2, 3091, 1099