Task: Program Execution
Input (English): 12, 18, ['4831', 't', 'S', '2743', '8769', '603', 'U', '7309', '7117', 'H', 'n', 'Y', 'x', '5901', 'A', 'W', '2855', 'x', '2485', 'd', '3947', '7355', '2697', 'H', '2443', 'k', '359']
Output (English): x5582WA1095xY