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.

['U', '1531', 't', '6929', 'P', '9619', 'G', 'g', '8511']
21, 1531, 20, 6929, 16, 9619, 7, 7, 8511

['N', '8821', 'U', 'X', 'N', '4125', 's', 'C', '9141']
14, 8821, 21, 24, 14, 4125, 19, 3, 9141

['d', '1947', '1083', 'M', '1771', '3375', '9353', 'U']

4, 1947, 1083, 13, 1771, 3375, 9353, 21