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', 'b', '1475', '1621', 'y', 'y', '5495', 'Q', 'O', 'n', '5039', '5735', 'K', '5007', '8187', '8757', 'K', 'A', 'R', '8961', 'N', 'X', 'j', '8255', 'T', 'u', 'G', 'N', 'C', '2245', 'C']

6, 2, 1475, 1621, 25, 25, 5495, 17, 15, 14, 5039, 5735, 11, 5007, 8187, 8757, 11, 1, 18, 8961, 14, 24, 10, 8255, 20, 21, 7, 14, 3, 2245, 3