Task: Program Execution
Input (English): 9, 10, ['8633', 'Q', 'h', 'r', '6939', 'U', 'F', '9823', '7707', 'a', 'C', 'o', '5621', 'V', 'S', 'f', 'u', '3607', '3883', 'U', '8939']
Output (English): 7707a