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: ['b', '4537', '8947', '8435', '7525', '1651', 'O', 'x', '4273', 'i', 'E', '2015', 'H', '879', 'S', '1589', '2537', 't', 'S', '1913', '9327', '8603', 'B', 'y']

2, 4537, 8947, 8435, 7525, 1651, 15, 24, 4273, 9, 5, 2015, 8, 879, 19, 1589, 2537, 20, 19, 1913, 9327, 8603, 2, 25