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: ['4151', 'C', 'J', '1453', '1677', 'r', 'c', '3569', 'K', 'E', '3665', '657', '3197', 'i', 'f', '9963', 'b', '8663', '8085', 'X', 'P', '6811', '3933', '4335', '9139', 'y', 'C', 'W', '4521']

4151, 3, 10, 1453, 1677, 18, 3, 3569, 11, 5, 3665, 657, 3197, 9, 6, 9963, 2, 8663, 8085, 24, 16, 6811, 3933, 4335, 9139, 25, 3, 23, 4521