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: ['9437', 'e', '4241', '3877', '2587', 'o', '4395', '3281', '4249', '1825', '855', 'Z', 'R', 'u', '97', '387', '1555', 'l', '1015', 'r', 'y', 'E']

9437, 5, 4241, 3877, 2587, 15, 4395, 3281, 4249, 1825, 855, 26, 18, 21, 97, 387, 1555, 12, 1015, 18, 25, 5