Task: Program Execution
Input (English): 4, ['Y', 'M', '1983', 'b', '3571', 'J', 'M', 'o', 'U', 'b', '4487', '3337', '8749', 'r', 'L', 'p', '6515', '9645', 'J', 'B']
Output (English): Y, M, 1983, b