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: ['P', 'A', '6519', '7629', '6029', 'v', 'I', 'Q', 't', 'w', 'X', '9159', 'u', '1081', '7431', '7863', '1429', '583', '4827', '5365', 'P', '5303', 'c', 'u', '7213', '6467', '5713', '4423']

16, 1, 6519, 7629, 6029, 22, 9, 17, 20, 23, 24, 9159, 21, 1081, 7431, 7863, 1429, 583, 4827, 5365, 16, 5303, 3, 21, 7213, 6467, 5713, 4423