Task: Program Execution
Input (English): 20, 23, ['u', '6611', '8087', 'C', 'W', '6865', '7121', 'A', '6167', 'x', 'k', '9801', 'W', '4993', '1001', '999', 'X', '749', '8937', '7665', '9187', '4277', '1007', 'O', '6391', '1807']
Output (English): 7665, 9187, 4277, 1007