Task: Program Execution
Input (English): 1707 W 1603 8401 7771 6897 r 821 1017 U 2935 b M 9501 7891 3831 C c 531 779 b 5009 3179 3009 I K t o
Output (English): 2, 7, 10, 12, 13, 17, 18, 21, 25, 26, 27, 28