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: ['4659', 'B', '6401', '4925', 'c', 'c', 'j', 'K', '7083', 'R', 'f']

4659, 2, 6401, 4925, 3, 3, 10, 11, 7083, 18, 6