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', '6333', '1381', '8855', 'P', 'F', '6959', '9949', 'b', '8683', '6851', '8891']

20, 6333, 1381, 8855, 16, 6, 6959, 9949, 2, 8683, 6851, 8891