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', '6153', 'e', 'C', '6445', '1229', '9463', 'U', 'O', 'd', 'h', 'r', '1221', 'q', 's', '151']

SOLUTION: 21, 6153, 5, 3, 6445, 1229, 9463, 21, 15, 4, 8, 18, 1221, 17, 19, 151

PROBLEM: ['i', '1075', 'r', '4813', 'N', 'Z', '6071', '1829', 'h', '2477']

SOLUTION: 9, 1075, 18, 4813, 14, 26, 6071, 1829, 8, 2477

PROBLEM: ['G', 'P', 'G', 'F', '9237', '2137', '325', 'S', 'b', '2965', 'B', 'u', 'U', 'L', 'z', '8141', 'A', '3031', '1831', 'h', '705', '6817', 'L', '1223', '813', 'p', '4955', '2443', '4783', 'X', '2215', 'Z', '4275', 'J', 'R', '3843']

SOLUTION:
7, 16, 7, 6, 9237, 2137, 325, 19, 2, 2965, 2, 21, 21, 12, 26, 8141, 1, 3031, 1831, 8, 705, 6817, 12, 1223, 813, 16, 4955, 2443, 4783, 24, 2215, 26, 4275, 10, 18, 3843