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: ['b', '2013', 'X', '5643', '8153', '663', '5185', '3309', 'h', '4101', 'j', '8339', 'p', 'U', 'j', 'L', '5493', 'v', 'W', 'L', '9951', 'L', 'U', 'D', 'o', 'K', '4279', '2235', '7371', 'o', '9233', '3875', 'a', '3021', '491']

2, 2013, 24, 5643, 8153, 663, 5185, 3309, 8, 4101, 10, 8339, 16, 21, 10, 12, 5493, 22, 23, 12, 9951, 12, 21, 4, 15, 11, 4279, 2235, 7371, 15, 9233, 3875, 1, 3021, 491