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: ['k', '5151', 'D', '8795', 'T', '5473', '453']

11, 5151, 4, 8795, 20, 5473, 453