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', 'c', 'y', 'a', 'j', '7079', 'x', 'R', 'C', '9827', '5491']

15, 3, 25, 1, 10, 7079, 24, 18, 3, 9827, 5491