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: ['6731', 'o', '2047', 'K', '4923', 'U', 'U', 'p', '5453', 'P', '9921', '1455', '5425', 'b', '1967', 'c', '9297', 'S', 'P', 'o', '2677', '5147', '6929', 'y', 'N', 'D', 'L', 'I', 'Q', 'M', '43', 'Q', 'O', 'x', 'D', 'O', 'V']

6731, 15, 2047, 11, 4923, 21, 21, 16, 5453, 16, 9921, 1455, 5425, 2, 1967, 3, 9297, 19, 16, 15, 2677, 5147, 6929, 25, 14, 4, 12, 9, 17, 13, 43, 17, 15, 24, 4, 15, 22