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: ['t', '4731', 'D', '1617', '8887', 'd', '5751', '707', 'V', 'k', 'p', 'V', '1923', 'K', 'k', 'f', 'r', 'G', 'P', 'h', 'f', 'O', 'd', 'd', 'u']

20, 4731, 4, 1617, 8887, 4, 5751, 707, 22, 11, 16, 22, 1923, 11, 11, 6, 18, 7, 16, 8, 6, 15, 4, 4, 21