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: ['2455', 'O', '8025', 'o', 't', 'Z', 'N', 'Z']

2455, 15, 8025, 15, 20, 26, 14, 26