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: ['G', 'a', 'j', '187', '2205', 'W', '57', '1457', 'l', '9283', '241', '1151', '7939', '5985', '2575', 't', 'o', 'r', 'k', 'j', '2109', '8537', '1297', 'l', 'X', 'a', 'E', 'C']

7, 1, 10, 187, 2205, 23, 57, 1457, 12, 9283, 241, 1151, 7939, 5985, 2575, 20, 15, 18, 11, 10, 2109, 8537, 1297, 12, 24, 1, 5, 3