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: ['5215', 'E', '7179', 'g', '849', 'x', 'E', 'O', '2747', '5597', 'u', 'o', '7199']

5215, 5, 7179, 7, 849, 24, 5, 15, 2747, 5597, 21, 15, 7199