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: ['Z', 'y', 'Y', '817', '3943', '5815', '4811', 'Z', '6329', 't', '8075', 'w', 'R', '8397', 'x', 'b', 'P', 'w', '3155', 'b', '9685', '257', '103', '3083', '6215', '4357', '4757', 'c', '3071', '515', 'N', 'W', '855']

26, 25, 25, 817, 3943, 5815, 4811, 26, 6329, 20, 8075, 23, 18, 8397, 24, 2, 16, 23, 3155, 2, 9685, 257, 103, 3083, 6215, 4357, 4757, 3, 3071, 515, 14, 23, 855