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: ['Z', '3677', '8679', '7179', '1223', 'o', '1481', '6035', '8547', 'x', 'f', '9551', 'U', '1993', 'L']

26, 3677, 8679, 7179, 1223, 15, 1481, 6035, 8547, 24, 6, 9551, 21, 1993, 12