Task: Program Execution
Input (English): 2, 18, ['m', '7773', '4811', '6887', 'Q', '9671', 'a', 'z', '2671', '7487', 'k', '8675', '8251', '6859', '9367', 'O', 'X', 'm', '6061']
Output (English): mXO7639958615285768k78471762za1769Q788611843777