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: ['9397', '4789', 'E', 'E', 'r', '3851', '7023', 'v', 'q', 't', 'y', '9265', '653', 'u', 'g', '9593', 'P', '2401', '9885', '7847', '3923', 'u', '4683', 'N', '8069', 'P', '1559', '9137']

9397, 4789, 5, 5, 18, 3851, 7023, 22, 17, 20, 25, 9265, 653, 21, 7, 9593, 16, 2401, 9885, 7847, 3923, 21, 4683, 14, 8069, 16, 1559, 9137