Task: Program Execution
Input (English): [4261, 'C', 1073, 3285, '6521', 'Z', '6999', 'q', 'e', 'v', 'Z'], ['B', 3785, '6521', 'Z', '6999', 'q', 'c', 'O', 'c']
Output (English): 6521, Z, 6999, q