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: ['2975', 'x', '797', '283', '4563', 'E', '893', 'X', '1721', 'A', '9851', '6743', 'W', 'K', '1973', '1731', 'M', '8111', 'M', 'N', 'H', '2431', 't', '5017', 'Q', '977', 'K', 'R', '4671', '4521', '6825', 'p', '4997', 'A', 's', '2435']

2975, 24, 797, 283, 4563, 5, 893, 24, 1721, 1, 9851, 6743, 23, 11, 1973, 1731, 13, 8111, 13, 14, 8, 2431, 20, 5017, 17, 977, 11, 18, 4671, 4521, 6825, 16, 4997, 1, 19, 2435