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: ['2835', 's', 'Z', 'B', 't', '975', '3775', 'h', 'M', '1687', '2107', '5371']

2835, 19, 26, 2, 20, 975, 3775, 8, 13, 1687, 2107, 5371