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: ['255', '4957', 'e', 'F', 'C', 'C', 'r', 'K', '1923', '4659', '8669', 'Y', 'P', 'n', '8917', 'L', '6069', '4343', '5533', '3411', 'X', '4363', 'J', '6653', 'k', 'I', 'k', '7653', 'X', '511', 'J', 'c']

255, 4957, 5, 6, 3, 3, 18, 11, 1923, 4659, 8669, 25, 16, 14, 8917, 12, 6069, 4343, 5533, 3411, 24, 4363, 10, 6653, 11, 9, 11, 7653, 24, 511, 10, 3