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: ['1565', 'b', '2455', '1511', '3995', '4545', 'x', '549', '3299', '4539', '2669', '6657', 'h', 't', '9321', '1507', 'U', 'U', '9783', 'h', 'p', 'a', '9039', '9987', '8211', 'N', 'I', '5409', '2049', 'Z', 'q', '7313', '8727']

1565, 2, 2455, 1511, 3995, 4545, 24, 549, 3299, 4539, 2669, 6657, 8, 20, 9321, 1507, 21, 21, 9783, 8, 16, 1, 9039, 9987, 8211, 14, 9, 5409, 2049, 26, 17, 7313, 8727