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: ['7909', '4237', '6293', 'V', 'G', '3163', 'S', '6489', 'r', 'G', '1955', 'l', '5015', 'W', 'D', '8031', '9073', '6437', '8751', 'X', 'v', 'O', '9905', 'n', '3121', 'l', '7877', 'H', 'b', 'x', '8627', '845']

7909, 4237, 6293, 22, 7, 3163, 19, 6489, 18, 7, 1955, 12, 5015, 23, 4, 8031, 9073, 6437, 8751, 24, 22, 15, 9905, 14, 3121, 12, 7877, 8, 2, 24, 8627, 845