Task: Program Execution
Input (English): 9, 15, ['N', 'E', '4757', 'M', '1881', 'P', '2903', '6779', 'q', 'a', 'o', '8579', 'Q', '5751', '4175', '3693', '8467', 'U']
Output (English): 41755751Q8579oaq