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: ['h', 'A', '5029', 'z', '5271', '4463', '9457', 'D', '7563', 'K', '5071', 'R']

8, 1, 5029, 26, 5271, 4463, 9457, 4, 7563, 11, 5071, 18