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: ['E', 's', '1847', 'X', '8411', '657', '2645', '8991', 'F', 'U', '7189', 'v', '7679', '4895', '8689', 'C', '2189', '1667', 'g', '343']

5, 19, 1847, 24, 8411, 657, 2645, 8991, 6, 21, 7189, 22, 7679, 4895, 8689, 3, 2189, 1667, 7, 343