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: ['K', 'y', '1421', '9787', '1661', 'k', '6051', '7447', '2453', 'C', '171', 'w', 'u', '7233', 'G', '1681', 'b', '2239', '7935', 'a', '8953', 'T', 'H', '3801', 'e', 'w', 'C', '4617', 'R', '2863', '1061', '7739', 'R', 'r', 'Z', '3541', 'l', '809']

11, 25, 1421, 9787, 1661, 11, 6051, 7447, 2453, 3, 171, 23, 21, 7233, 7, 1681, 2, 2239, 7935, 1, 8953, 20, 8, 3801, 5, 23, 3, 4617, 18, 2863, 1061, 7739, 18, 18, 26, 3541, 12, 809