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: ['T', '5563', 'j', 'i', '5585', '9397', 'c', 'n', '8761', 'r', 'R', 'p', 'F', '671', 'f', '759', '8951', 'E']

20, 5563, 10, 9, 5585, 9397, 3, 14, 8761, 18, 18, 16, 6, 671, 6, 759, 8951, 5