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: ['5373', '1839', 'C', 'N', 'p', '971', '9807']

5373, 1839, 3, 14, 16, 971, 9807