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: ['7971', '6595', '5145', 'R', '5055', 'F', '3827', '2319', 'f', '4971', '6241', 'e', 'E', 'X', '7133', 'y', '5119', 'F', 'G', 'o', 'E', 'O', 'Z', '8569', 'S']

7971, 6595, 5145, 18, 5055, 6, 3827, 2319, 6, 4971, 6241, 5, 5, 24, 7133, 25, 5119, 6, 7, 15, 5, 15, 26, 8569, 19