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: ['U', 'i', '1763', '2963', '4669', '9263', 'K', '5701', '9193']

21, 9, 1763, 2963, 4669, 9263, 11, 5701, 9193