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: ['L', 'h', 'W', 'S', '2045', '4149', '5907', 'x', '5533', '6489', 'K', '4887', 'h', 'f', 'L', 'r']

12, 8, 23, 19, 2045, 4149, 5907, 24, 5533, 6489, 11, 4887, 8, 6, 12, 18