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: ['B', 'f', '1921', 'y', '565', '7421', '2493', 'D', '2241', 'm', 'z', '2197', '6987', 'V', '4507', 'x', 'e', '8419', 'R', 'u', 't', 'Y', 'D', 'o', 'u', 'y', '7479', '533', 't', '9125', 'd', '4537', '9071', '4133', 'v', 'r', 'k', 'b', '4851']

2, 6, 1921, 25, 565, 7421, 2493, 4, 2241, 13, 26, 2197, 6987, 22, 4507, 24, 5, 8419, 18, 21, 20, 25, 4, 15, 21, 25, 7479, 533, 20, 9125, 4, 4537, 9071, 4133, 22, 18, 11, 2, 4851