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: ['2919', '3497', 'B', 'Y', 'E', 'p', 'G', '6155', 'r']

2919, 3497, 2, 25, 5, 16, 7, 6155, 18