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: ['8601', 'I', '8021', 'E', 'u', 'j', '2171', 'f', 'D', '1949', 'Q', '1751', 't', 'q', 'R', '7389', '4031', 'U', 'U']

8601, 9, 8021, 5, 21, 10, 2171, 6, 4, 1949, 17, 1751, 20, 17, 18, 7389, 4031, 21, 21