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: ['5409', '8935', '3919', 'x', '6913', 'Q', 'd', '7851', 'I', '2969', 'p', '5963', 'l', '5657', '2249', 'Y', 'z', '1885', '5789', '2707', '4157', '1849', 'm', '5247', '4969', '5327', '335', 'k', '1215', 'b', '7235']

5409, 8935, 3919, 24, 6913, 17, 4, 7851, 9, 2969, 16, 5963, 12, 5657, 2249, 25, 26, 1885, 5789, 2707, 4157, 1849, 13, 5247, 4969, 5327, 335, 11, 1215, 2, 7235