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: ['p', '6689', '4335', 'i', '9359', 't', '9599', '7585', 'S', '2549', '7559', 'W', '901', 'b', '7321', '1265', 'O', 'Z', '31', 'a', '6361', 'T', '7991', '1165', 'S', 'g', 'B', 'H', '6727', '7821', 'x', 'v']

16, 6689, 4335, 9, 9359, 20, 9599, 7585, 19, 2549, 7559, 23, 901, 2, 7321, 1265, 15, 26, 31, 1, 6361, 20, 7991, 1165, 19, 7, 2, 8, 6727, 7821, 24, 22