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: ['341', '7621', '1227', '5517', '1431', 'J', 'u', 'r', '129', 'U', 'h', 'Q']

341, 7621, 1227, 5517, 1431, 10, 21, 18, 129, 21, 8, 17