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: ['t', '4751', '8319', '4725', 'y', 'S', 'B', 'b', 'd', 'C', 'u', '9641', 'W', 'Z', 'b', 'O', '4671', 'p', 't', '1573', '7407', 'S', '8085', '6363', 'w', '5453', '3069', 's', 'M', 'T', 'Q', 'q', 'K', '8481', 'i']

20, 4751, 8319, 4725, 25, 19, 2, 2, 4, 3, 21, 9641, 23, 26, 2, 15, 4671, 16, 20, 1573, 7407, 19, 8085, 6363, 23, 5453, 3069, 19, 13, 20, 17, 17, 11, 8481, 9