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: ['7765', 'l', '6389', '9897', '4151', '2901']

7765, 12, 6389, 9897, 4151, 2901