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: ['7209', '4779', 'O', 'F', '3827', 'P', '5887', 'c', '5067', '4307', 'm', 'I', '9243', 'O', 'j', 'z', 'G', '5549', '8459', 'T', '4367', 's', '9283', '6713', 'H', '8133', '7443', 'T', '8251', 'X', 'N', 's', 'c']

7209, 4779, 15, 6, 3827, 16, 5887, 3, 5067, 4307, 13, 9, 9243, 15, 10, 26, 7, 5549, 8459, 20, 4367, 19, 9283, 6713, 8, 8133, 7443, 20, 8251, 24, 14, 19, 3