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: ['w', 'B', '8745', '7201', '3535', 'c', '7005', '9503', 't', '4217', 'b', '2779', 'l', '4671', '3213', '6267', '6339', 'a', 'Y', 'U', 't', 'l']

23, 2, 8745, 7201, 3535, 3, 7005, 9503, 20, 4217, 2, 2779, 12, 4671, 3213, 6267, 6339, 1, 25, 21, 20, 12