Task: Program Execution
Input (English): 15, 18, ['3665', '8799', 'M', '7717', '3221', '1957', '7631', '5299', '2455', '9331', 'N', '5847', '3955', 'W', 's', 'c', '3801', '733', 'u', 't', 'c']
Output (English): sc3801733