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: ['1149', 'k', '1235', 'q', 'B', 'C', 'y', 'R', '7909', '6009', 'T', '3255']

1149, 11, 1235, 17, 2, 3, 25, 18, 7909, 6009, 20, 3255