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: ['5309', '219', '4913', 'B', '6445', 'v', '3727', 'L', '1595', 'A', '8229', 'b', 'y', 'n', 'r', 'f', 'F', '3667', '4643', 'K', '5687', '2737']

5309, 219, 4913, 2, 6445, 22, 3727, 12, 1595, 1, 8229, 2, 25, 14, 18, 6, 6, 3667, 4643, 11, 5687, 2737