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: ['E', 'u', 'T', '1831', '427', 'x', '6695', '9023', 'L', 'B', '5437', '6875', 'J', 'k', 'P', '2815', 'k', 'g', 'h', '5889', '7455', '7949', 'N']

5, 21, 20, 1831, 427, 24, 6695, 9023, 12, 2, 5437, 6875, 10, 11, 16, 2815, 11, 7, 8, 5889, 7455, 7949, 14