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: ['f', '7835', '8173', 'e', 'R', 'F', '1877', 'd', 'p', '6089', 'r', 't', 'r', 'c', '2921', '7811', '4565', 'D', '8515', '3475', '8683', '1557', '1393', '6133', 'm', 'Z', '2431', '3227', 'g', '2861']

6, 7835, 8173, 5, 18, 6, 1877, 4, 16, 6089, 18, 20, 18, 3, 2921, 7811, 4565, 4, 8515, 3475, 8683, 1557, 1393, 6133, 13, 26, 2431, 3227, 7, 2861