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: ['h', 'R', 'A', '6015', '7633', 'L', '2509']

8, 18, 1, 6015, 7633, 12, 2509