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: ['4805', '2595', 'S', 'N', 'T', 'm', 'P', 'j', '1101', '1505', 'l', 'R']

4805, 2595, 19, 14, 20, 13, 16, 10, 1101, 1505, 12, 18