Task: Program Execution
Input (English): 1, 15, ['4487', '1323', '5287', 'z', 'I', '8497', 'M', '4115', '29', 'm', '7619', '1933', '9043', 'y', '2421', 'I', 'f', '7987', 'I', '7683', 'n']
Output (English): 2421y904319337619m294115M8497Iz528713234487