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: ['731', 'S', '1069', 'l', 'C', 'c', '3617', '3531', 'd', '8541', '9045', 's', 't', 'o', 'X', '4723', 'O', '6875', 'Y', '3453', 'q', 'o', '8759', '4821', 'V', 'Z', 'C', '6753', 'J']

731, 19, 1069, 12, 3, 3, 3617, 3531, 4, 8541, 9045, 19, 20, 15, 24, 4723, 15, 6875, 25, 3453, 17, 15, 8759, 4821, 22, 26, 3, 6753, 10