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: ['7739', 'X', 'c', '6685', 'r', '9127', 'N', '2001', 'Q', '2145', 'W', 'g', 'g', '6679', '8303', 'M', '7479', 'H', 'W', 'b', '1223', '6643', '227', 't', '1503', 'w', 'l', '9797', '5057', '5921', 'c', '6923', 'a', '1587', '1769', 's', 'K', 'E']

7739, 24, 3, 6685, 18, 9127, 14, 2001, 17, 2145, 23, 7, 7, 6679, 8303, 13, 7479, 8, 23, 2, 1223, 6643, 227, 20, 1503, 23, 12, 9797, 5057, 5921, 3, 6923, 1, 1587, 1769, 19, 11, 5