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: ['5197', 'V', 'T', 'A', 's', 'K', 'U', '4277', '5783', 'u']

5197, 22, 20, 1, 19, 11, 21, 4277, 5783, 21