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.
Q: ['4295', 'b', '6907', '9257', 'b', 'T', '3089', '4893', 'o', '1453', 'Y', 'w', '8355', 'R', '9847', '8235', 'H', '7459']
A: 
4295, 2, 6907, 9257, 2, 20, 3089, 4893, 15, 1453, 25, 23, 8355, 18, 9847, 8235, 8, 7459