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: ['r', 'Q', 'U', 'Q', 'D', '1617', '1281', '5249', '8327', 'D', '8647', 'b', '7641', 's', '7617', '8211', 'd', '2941', 'H', '7539', '3013', '5305', '6265']

18, 17, 21, 17, 4, 1617, 1281, 5249, 8327, 4, 8647, 2, 7641, 19, 7617, 8211, 4, 2941, 8, 7539, 3013, 5305, 6265