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: ['C', 'j', '8615', 'r', 'q', '319', '249', 'W', 'K', '2719', 'Y', 'b', 'i']

3, 10, 8615, 18, 17, 319, 249, 23, 11, 2719, 25, 2, 9