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: ['4247', '1237', '437', 'E', '9453', 'r', '9851', '5289', 'w', 'd', '4467', 'o', 't', 'm', 'I', 'v']

4247, 1237, 437, 5, 9453, 18, 9851, 5289, 23, 4, 4467, 15, 20, 13, 9, 22