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: ['8269', 'O', '919', 'j', '4577', 'W', '5309', '9295', 'U', 'k', '6547', 'U', '7863', 'h', '2869']

8269, 15, 919, 10, 4577, 23, 5309, 9295, 21, 11, 6547, 21, 7863, 8, 2869