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: ['B', '6857', '9253', 't', '9693', 'v', '5557', '3047', '289', '4463', 'T', 'Z', 'g', 'C', 'w', 'E', 'j', '7293', 't', '855', '7105', 'u', 'n', '5781', '4005', 'P', '1007', '2197', '4009', 'v', '4807', '381', 'h', '6795']

2, 6857, 9253, 20, 9693, 22, 5557, 3047, 289, 4463, 20, 26, 7, 3, 23, 5, 10, 7293, 20, 855, 7105, 21, 14, 5781, 4005, 16, 1007, 2197, 4009, 22, 4807, 381, 8, 6795