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: ['4227', 'y', '1921', 'u', '7335', '455', 'A', 'Y', '587', 'k', 'i', 'a', '1823', 'v', 'h', 'g', '4187', '3607', '455', 'y']

4227, 25, 1921, 21, 7335, 455, 1, 25, 587, 11, 9, 1, 1823, 22, 8, 7, 4187, 3607, 455, 25