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: ['o', '5543', 'D', '849', 'l', 't', 'u', 'D', '2677', 'B', '2929', '3743', '4563', 'V', '3797', '3819', 'n', 'v', '5985', 'I', 'h', 'p', '2227', 'h', 'E', 'm', 'u', 'b', 'h', 'N', '5817', '3921', '5623', '5509', '5275', 'X', '1543']

15, 5543, 4, 849, 12, 20, 21, 4, 2677, 2, 2929, 3743, 4563, 22, 3797, 3819, 14, 22, 5985, 9, 8, 16, 2227, 8, 5, 13, 21, 2, 8, 14, 5817, 3921, 5623, 5509, 5275, 24, 1543