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: ['4749', 'U', '4693', 'w', '5225', 'E', '6239', 'X', 'A', 'S', '705', '773']

4749, 21, 4693, 23, 5225, 5, 6239, 24, 1, 19, 705, 773