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: ['6051', '7265', '7551', 'X', '4183', 'A', 'v', 'V', 'U', '807', '8675', 'V', '3827', 'N', 'P', '1327', 'A', '1493']

6051, 7265, 7551, 24, 4183, 1, 22, 22, 21, 807, 8675, 22, 3827, 14, 16, 1327, 1, 1493