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: ['E', 's', '3891', 'q', 'J', 'g', 'g', '607', '5729', 'F', '9161', 'M', '6453', '9105', '9359', 'f', 'I', 'B']

5, 19, 3891, 17, 10, 7, 7, 607, 5729, 6, 9161, 13, 6453, 9105, 9359, 6, 9, 2