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', '1395', 'E', 'n', 'C', 'L', '2767', '9503', 'h', '4837', 'B', 'h', '7979', '2923', 'b', '5501', 'M', '9741', 'Y', '2587', '9373', '4759', 'i', '3745']

18, 1395, 5, 14, 3, 12, 2767, 9503, 8, 4837, 2, 8, 7979, 2923, 2, 5501, 13, 9741, 25, 2587, 9373, 4759, 9, 3745