Task: Program Execution
Input (English): 12, 21, ['x', '4109', 'K', 'E', 's', '4359', '6155', 'o', 'e', '1193', '2679', '2273', 'd', '7581', 'D', '4099', 'U', '9277', '9407', '6861', '2931', '4545', 'n']
Output (English): 2273, d, 7581, D, 4099, U, 9277, 9407, 6861, 2931