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: ['3415', 'V', 'b', 'y', 'D', '345', '3149']

3415, 22, 2, 25, 4, 345, 3149