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: ['3535', '9163', '777', 'b', '757', 'k', 'W', '6491', 'C', '4573', '6325', '3681', '5', 't', 'H', '2303', 'u', '1913', '8973', '4991', 'I', 'H', '8357', 'm', '6699', '6051', '7649', '5071', 'w', 'G', 'G', '2953', '5749', '4055', '4049', 'x', 'R', '6865', '2279', '2391']

3535, 9163, 777, 2, 757, 11, 23, 6491, 3, 4573, 6325, 3681, 5, 20, 8, 2303, 21, 1913, 8973, 4991, 9, 8, 8357, 13, 6699, 6051, 7649, 5071, 23, 7, 7, 2953, 5749, 4055, 4049, 24, 18, 6865, 2279, 2391