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: ['B', 'o', 'M', 'Y', 'J', 'L', '8747', '2927']

2, 15, 13, 25, 10, 12, 8747, 2927