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: ['2759', '9609', '2859', '4413', '4807', '9661', 'N', 'k', 'r', 'h', 'l', '4617', 'p', '6713', '2869', '6737', 'E', '2299', 'l', 'J', 'F', '9137', 'G']

2759, 9609, 2859, 4413, 4807, 9661, 14, 11, 18, 8, 12, 4617, 16, 6713, 2869, 6737, 5, 2299, 12, 10, 6, 9137, 7