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

['7495', 'm', 'I']
7495, 13, 9

['1131', '6387', '5981', '4257', 'U', 'Q', 'q', 'Y', 'z', 'T', '7111', 'G', 'i', 'T', '453', '5219', '7693']

1131, 6387, 5981, 4257, 21, 17, 17, 25, 26, 20, 7111, 7, 9, 20, 453, 5219, 7693