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: ['5473', '3897', 'E', '7551', 'U', 'l', 'C', 'p', 'w', 'g']

5473, 3897, 5, 7551, 21, 12, 3, 16, 23, 7