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: ['u', 'r', 'L', '421', 'i', '3273', 'P', 'N', '1165', 'p', 'h', '8059', 'v', '8585', '9243', '1431']

21, 18, 12, 421, 9, 3273, 16, 14, 1165, 16, 8, 8059, 22, 8585, 9243, 1431