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: ['753', 'x', '3851', '7915', 'c', 'y', '8015', 'b', '1507', 'a', 'l', '3039', '3565', '8755', '5953', 'f', 'a', 'Q', 'V', 'l', 'K', '8279', 'Z', '1849', 'k', 'j', '651', 'B', 'K']

753, 24, 3851, 7915, 3, 25, 8015, 2, 1507, 1, 12, 3039, 3565, 8755, 5953, 6, 1, 17, 22, 12, 11, 8279, 26, 1849, 11, 10, 651, 2, 11