Task: Program Execution
Input (English): 1, 6, ['D', '5981', '8241', 'R', '1945', 'U', '9781', '4403', 'Z', '3921', 'b', '5597', 'T', '6849', 'Q', '2913', 'B', '591', '933']
Output (English): D, 9781, T, 933