Task: Program Execution
Input (English): 4, 13, ['W', '6853', 'a', 'r', 'B', '4757', 'r', 'i', '1279', 'u', '6355', 'Z', '1311', 'a', '2289', 'H', 'y', '5259', 'a', 'g', 'D', '5701', 'G', '659', 'I', '9221']
Output (English): r, y