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: ['E', 's', '4969', '2009', 'Q', '9407', 'C', '2085', '2575', 'W', 'c', '4733', 'f', '6581', 't', '2641', '9123', 'Q', 'j', '3387', '115', '155', '6175', '5853', 'm', '1859']

5, 19, 4969, 2009, 17, 9407, 3, 2085, 2575, 23, 3, 4733, 6, 6581, 20, 2641, 9123, 17, 10, 3387, 115, 155, 6175, 5853, 13, 1859