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: ['751', 'J', '5717', 'U', '7815', 'H', '6989', '7381', '1381', 'q', 'r', '5589', '9993', '1517', 'p', 'b', '7747', 't', 'i', '7531', '8143', '3439', 'V', '6519', '2335', 'p', '9795', '1885', '8531', 'a', 'C', '4367', 'T', '4509', '5443', 'v', '6217', '3805', '9819']

751, 10, 5717, 21, 7815, 8, 6989, 7381, 1381, 17, 18, 5589, 9993, 1517, 16, 2, 7747, 20, 9, 7531, 8143, 3439, 22, 6519, 2335, 16, 9795, 1885, 8531, 1, 3, 4367, 20, 4509, 5443, 22, 6217, 3805, 9819