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: ['1981', 'a', 'Y', 'L', '1059', '3901', '4133', '5395', '7065', '1539', '7501', '4903', '6165', '3115', 'N', '8449', 't', '445', '4165', '8455', '6789', '9597', '7081', '3709', 'j', '1823', '6287', '5239', '6533', 'J', 'X', '6155', 'u', '3925', 'd', 'B', '7751', 'K', 'f', '8325']

1981, 1, 25, 12, 1059, 3901, 4133, 5395, 7065, 1539, 7501, 4903, 6165, 3115, 14, 8449, 20, 445, 4165, 8455, 6789, 9597, 7081, 3709, 10, 1823, 6287, 5239, 6533, 10, 24, 6155, 21, 3925, 4, 2, 7751, 11, 6, 8325