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: ['905', 'C', 'u', '551', 'e', '3815', '2553', '5833', '209', 'F', '679', 'b', '2137', 'm', '517', 'Y', 'u', 'y', '439', '1535', 'r', '3919', '9795', 'v', '7001', '4177', 'A', '873', '1429', '4761']

905, 3, 21, 551, 5, 3815, 2553, 5833, 209, 6, 679, 2, 2137, 13, 517, 25, 21, 25, 439, 1535, 18, 3919, 9795, 22, 7001, 4177, 1, 873, 1429, 4761