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', '821', '8521', 'p', 'o', '979', 'k', 'w', '2213']

18, 821, 8521, 16, 15, 979, 11, 23, 2213