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: ['C', '6769', 'H', 'M', '7483', '5585', 'y', 'v', 'q', 'R', 'x', 'Q', 'r', '39', 'W', '8837', '5981', '1181', '143', 'V', 'B', 'w', 'u', '8789', '2695', '2319', '3637', 'p', '9477', '1927', 'N', 'K', 'G', 'B', '4667', '137', 'n', 'j', '5055']

3, 6769, 8, 13, 7483, 5585, 25, 22, 17, 18, 24, 17, 18, 39, 23, 8837, 5981, 1181, 143, 22, 2, 23, 21, 8789, 2695, 2319, 3637, 16, 9477, 1927, 14, 11, 7, 2, 4667, 137, 14, 10, 5055