Task: Program Execution
Input (English): 18, 21, ['1691', '3603', '9809', 'y', 'O', 'v', '7223', '6539', '5415', '6137', 'U', '5779', '3433', 'C', '4573', 'j', '7137', '4901', 'n', '7603', 'd', '6463', '8235', '8915', 'W', '7077']
Output (English): d, 7603, n, 4901