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: ['1665', 'D', 'T', '2171', 'I', '5281', 'E']

1665, 4, 20, 2171, 9, 5281, 5