TASK 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.
PROBLEM: ['u', 'n', '2763', 'n', '5869', 'w', '4847', '4369', '8245', '9801', 'W', '7991', 't', '9233', 'Z', '3521', 'Z', 'H', 'N', 'a', '9811', '5705', '6637', '5067', 'o']

SOLUTION: 21, 14, 2763, 14, 5869, 23, 4847, 4369, 8245, 9801, 23, 7991, 20, 9233, 26, 3521, 26, 8, 14, 1, 9811, 5705, 6637, 5067, 15

PROBLEM: ['n', '1835', '6523', '6879', '1757', 'N', '2327']

SOLUTION: 14, 1835, 6523, 6879, 1757, 14, 2327

PROBLEM: ['5577', '1577', 'G', 'q', '6953', 'w', '5419', '3429', 'B', 'v', 'B', 'X', 'b', '7941', 'i', '5283', 'R', '2917', 'Q', 'J', 'H']

SOLUTION:
5577, 1577, 7, 17, 6953, 23, 5419, 3429, 2, 22, 2, 24, 2, 7941, 9, 5283, 18, 2917, 17, 10, 8