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: ['S', 'c', 'J', 'c', 'g', '2551', '9581', 'G', '1223', '699', 'V', 'g', '2523', 'U', 'O', '2665', '1745', '1735', '3527', '629', 'H', '9041', '615', 'Y', '759', '229', 'O', 'U', 'N', 'z', 'r', 'g', '9765', 'A', '4083', 'J', '9747', 'a', '8325', 'B']

19, 3, 10, 3, 7, 2551, 9581, 7, 1223, 699, 22, 7, 2523, 21, 15, 2665, 1745, 1735, 3527, 629, 8, 9041, 615, 25, 759, 229, 15, 21, 14, 26, 18, 7, 9765, 1, 4083, 10, 9747, 1, 8325, 2