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: ['7221', '8249', 'G', '2339', 'f', 'G', 'S', '3015', '1887', 'b', '7897', 'z', 'B', 'D', '3905', 'f', '5017', '4883', '65', 'N', 'o', '4079', '9631', 'c', '6391']

7221, 8249, 7, 2339, 6, 7, 19, 3015, 1887, 2, 7897, 26, 2, 4, 3905, 6, 5017, 4883, 65, 14, 15, 4079, 9631, 3, 6391