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: ['1021', 'Y', '5565', 'M', 'S', 'Q', '7879', 'j', 'c', 'F', '191', '7875', 'r']

1021, 25, 5565, 13, 19, 17, 7879, 10, 3, 6, 191, 7875, 18