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', 'b', '4907', 'k', '5295', 'I', '6803', 'g', '801', '2809', 'R', '7881', '2763', 'p', 'J', 'Q', '373', '9145', '8987', '3413', '2679', '3641', 'Z', '6427', '3547', '6105', 't', 'y', '6455']

2, 2, 4907, 11, 5295, 9, 6803, 7, 801, 2809, 18, 7881, 2763, 16, 10, 17, 373, 9145, 8987, 3413, 2679, 3641, 26, 6427, 3547, 6105, 20, 25, 6455