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: ['3997', '2947', 'p', '5323', '2707', '9679', '6655', '6245', 'G', 'g', 'B', 'W', 'C', '7263', '4071', 'x', '8703', 'g', 'k', 'S', '5043', '7511', 'U', 'v', '7011', 'B', 'g', '2301', 'L', '6553']

3997, 2947, 16, 5323, 2707, 9679, 6655, 6245, 7, 7, 2, 23, 3, 7263, 4071, 24, 8703, 7, 11, 19, 5043, 7511, 21, 22, 7011, 2, 7, 2301, 12, 6553