Task: Program Execution
Input (English): 13, 21, ['G', '2901', '5315', '7623', 'C', 'b', 'r', 't', '4573', 'y', '2159', '1235', '723', 'N', '8237', '929', '9721', 'b', '4107', '6539', 'M', 'U', 'O', 'T']
Output (English): M, 6539, 4107, b, 9721, 929, 8237, N, 723