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: ['o', '3827', 'L', 's', 'd', '3615', '8863', 'm', 'p', '7377', 'f']

15, 3827, 12, 19, 4, 3615, 8863, 13, 16, 7377, 6