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: ['n', 'F', '5049', '9371', 'a', '4455', 'm', 'e', '1901', '5149', 'd', 'j']

14, 6, 5049, 9371, 1, 4455, 13, 5, 1901, 5149, 4, 10