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: ['r', 'A', 'H', 'k', 'z', '5795', '1135', '5851', '1397', 'A', 'o', '4241', 'u', '4167', '779', 'E', 'I', '9857', '1429', '9787', 'T', 'R', '9627', 'c', '9017', '7155', 't', '7273', 'k']

18, 1, 8, 11, 26, 5795, 1135, 5851, 1397, 1, 15, 4241, 21, 4167, 779, 5, 9, 9857, 1429, 9787, 20, 18, 9627, 3, 9017, 7155, 20, 7273, 11