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: ['E', '8627', 'D', '9029', 'l', '1295', '2729', 'u', '4463', '5345', 'D', 'c', 'c']

5, 8627, 4, 9029, 12, 1295, 2729, 21, 4463, 5345, 4, 3, 3