Task: Program Execution
Input (English): 11, 18, ['2173', 'U', 'H', '581', 'I', 'P', '1835', '4423', 's', 'm', 'T', 'n', '2677', '7003', 'b', '8375', 'B', 'C']
Output (English): T, n, 2677, 7003, b, 8375, B, C