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: ['6477', '4701', '489', 'X', 'x', 'c', 'm', 'o', '7689', 'f', 'X', 'S', 'u', 'S', 'l', 'v', '1515', '5401', '6707', 'm', 'Z', '6071', 'A', 'f', 'w', 'M', '9297', '3133', 'b', '4689', 'B']

6477, 4701, 489, 24, 24, 3, 13, 15, 7689, 6, 24, 19, 21, 19, 12, 22, 1515, 5401, 6707, 13, 26, 6071, 1, 6, 23, 13, 9297, 3133, 2, 4689, 2