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: ['Y', '6503', '5589', '8169', 'p', '7033', '7269', 'h', '5413', 'K', 'b', '3887', 'U', 'V', '7103', 'a', 'Y', '4815', 'o', 'a', 'f', 'z', '5279', '1379', 't', 'a', '4175', '9103', '7331', '3653', 'j', '8769', 'K']

25, 6503, 5589, 8169, 16, 7033, 7269, 8, 5413, 11, 2, 3887, 21, 22, 7103, 1, 25, 4815, 15, 1, 6, 26, 5279, 1379, 20, 1, 4175, 9103, 7331, 3653, 10, 8769, 11