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: ['6453', 'I', '8305', 'h', '1405', 'F', 'R', 'j', 'B', 'Q', '9577', 's', 'x', 'g', '7063', '5257', '2227', '6137', '7407', 'Q', '3683', 'g', '2353']

6453, 9, 8305, 8, 1405, 6, 18, 10, 2, 17, 9577, 19, 24, 7, 7063, 5257, 2227, 6137, 7407, 17, 3683, 7, 2353