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: ['4709', 'g', '8071', '229', '6335', 'G', 'N', 'M', '8877', 'G', 'C', 'M', 'm', '6165', 'W', '4261', '1665', 'R', '3811', '9357']

4709, 7, 8071, 229, 6335, 7, 14, 13, 8877, 7, 3, 13, 13, 6165, 23, 4261, 1665, 18, 3811, 9357