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: ['5243', 'p', '7179', '4687', 'T', '2835']

5243, 16, 7179, 4687, 20, 2835