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: ['5381', 't', 'e', 'F', 'R', 'z', 'B', '3511', '5759']

5381, 20, 5, 6, 18, 26, 2, 3511, 5759