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: ['7281', 'e', '8105', '3741', 'R', 't', 'U', 'V', '8747', 'p', 'r', '3363', '8011', 'v', 's', 'H', '5413', 'M']

7281, 5, 8105, 3741, 18, 20, 21, 22, 8747, 16, 18, 3363, 8011, 22, 19, 8, 5413, 13