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: ['259', 's', '9731', '5053', '8551', '3969', '8973', 'W', 'K', '4365', 'i', 'U', 'x', 'O', 'w', 'Q', '8805', 'd', '483', 'I', 'b', '2753', '545']

259, 19, 9731, 5053, 8551, 3969, 8973, 23, 11, 4365, 9, 21, 24, 15, 23, 17, 8805, 4, 483, 9, 2, 2753, 545