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: ['7999', '8083', 'g', '2545', '7831', '3727', 'I']

7999, 8083, 7, 2545, 7831, 3727, 9