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', '2227', 'U', 'h', '55', 'h', '3591', '2867', '173', 'p', '1131', '2187', '4591', 'X', 'D', '4707', '8243', '3097', 'y', 'J', '6093', '15', '3791', 'z', 'N', 'k', '5545', 'p', 'v', 'J', '9259', 'b']

18, 2227, 21, 8, 55, 8, 3591, 2867, 173, 16, 1131, 2187, 4591, 24, 4, 4707, 8243, 3097, 25, 10, 6093, 15, 3791, 26, 14, 11, 5545, 16, 22, 10, 9259, 2