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: ['F', '1025', 'd', '1479', 'u', '6833', '155', '1495', 'n', 'u', '7397', '1287', 'x', 'h', 'j', 'P', 'a', '6481', '8521', 't', '5607', '1421', 'v']

6, 1025, 4, 1479, 21, 6833, 155, 1495, 14, 21, 7397, 1287, 24, 8, 10, 16, 1, 6481, 8521, 20, 5607, 1421, 22