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: ['F', 'L', '4731', 's', '2211', 'm', 'I', '8925', '8187', 'U', '7809', '3915', '8723', 'L', '2565', '8297', 'R', '3983', 'n', 't', '847', 'm', '183', 'V', '9785', 'c', '1411', '9087', 'j', 's', '4493', 'a']

6, 12, 4731, 19, 2211, 13, 9, 8925, 8187, 21, 7809, 3915, 8723, 12, 2565, 8297, 18, 3983, 14, 20, 847, 13, 183, 22, 9785, 3, 1411, 9087, 10, 19, 4493, 1