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: ['8437', '7453', '2137', '5063', 't', 'Q', 'C', '6581', '2773', 'c', 'P']

8437, 7453, 2137, 5063, 20, 17, 3, 6581, 2773, 3, 16