Task: Program Execution
Input (English): 11, 15, ['U', 'q', '5235', 'C', 'x', 'M', 'K', '4911', 'U', '9591', 'R', '3243', '371', '6771', 'I', '4235', 'O', 'O', '5053', 'q', '77']
Output (English): I67713713243R