Task: Program Execution
Input (English): 4, 5, ['7631', 'I', '7755', 'M', '1871', 'a', '337', '9875', 'C', 'K', '4721', 's', '8399', 'h', 'g', '4573', '571', '5673', 'K', 'b', '6821', 's', '1105']
Output (English): 1871M