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: ['2037', 'Y', '6867', 'L', 'U', '7081', '1479', 'L', 'P', '7169', 'J', 'S', '5077', '3253', '591', '7787', '4925', 'y', 'X', '2489', '4787', 'C', 'c', '219', 't', 'L']

2037, 25, 6867, 12, 21, 7081, 1479, 12, 16, 7169, 10, 19, 5077, 3253, 591, 7787, 4925, 25, 24, 2489, 4787, 3, 3, 219, 20, 12