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.

['N', '8821', 'U', 'X', 'N', '4125', 's', 'C', '9141']
14, 8821, 21, 24, 14, 4125, 19, 3, 9141

['A', 'M', '4265', 'P', 'e', 'W', 'I', '7481', 'a', 'L', 'w', '2891', '347', '6469', 'T', 'I', '7517', '9357', 'v', 'd', 'N', 'S', 'G', '4715', '235', '359']
1, 13, 4265, 16, 5, 23, 9, 7481, 1, 12, 23, 2891, 347, 6469, 20, 9, 7517, 9357, 22, 4, 14, 19, 7, 4715, 235, 359

['c', 'Q', 'U', '1817', 'T', '5131', 'Z', '8437', 'x', 'e', 'v', '8141', 'd', 't']

3, 17, 21, 1817, 20, 5131, 26, 8437, 24, 5, 22, 8141, 4, 20