Task: Program Execution
Input (English): 1421 D 6913 5987 u j b L 7877 2509 9101 e 8189 D 685 7417 y r 2125 Y 165 S G 5607 3655 3175 q i
Output (English): 2, 5, 6, 7, 8, 12, 14, 17, 18, 20, 22, 23, 27, 28