Task: Program Execution
Input (English): 15, 21, ['J', 'b', 'T', 'K', 'h', 'H', '1073', 'Y', '9981', 'f', 'F', 'H', '623', 'b', '7921', 'm', '6545', '2415', '529', 'U', 's', 'I']
Output (English): sU52924156545m7921