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: ['r', '61', 'g', 'N', '8235', '4739', 'u', '7323', 'n', 'x', '8817', '1559', '2021', '1689', 'e', 'U']

18, 61, 7, 14, 8235, 4739, 21, 7323, 14, 24, 8817, 1559, 2021, 1689, 5, 21