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: ['2963', '2437', '5033', '9621', 'Z', '7947', '7493', '341', 'n', 'T', 'j', '1221', 'j', '5627', '1853', '4915', 'G', 'o', 'M']

2963, 2437, 5033, 9621, 26, 7947, 7493, 341, 14, 20, 10, 1221, 10, 5627, 1853, 4915, 7, 15, 13