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: ['7899', '4321', '2905', 'N', '6999', 'X', 'p', '8289', '6841', '227', 'z']

7899, 4321, 2905, 14, 6999, 24, 16, 8289, 6841, 227, 26