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: ['9975', 'P', '6009', 'R', 'F', 'v', 'l', '6113', '9391', '79', '5291', '7259', '8273', 'f', 'I', '9923', 'a', 'o', '6941', '8727', 'Y', 'M', 'K']

9975, 16, 6009, 18, 6, 22, 12, 6113, 9391, 79, 5291, 7259, 8273, 6, 9, 9923, 1, 15, 6941, 8727, 25, 13, 11