Task: Program Execution
Input (English): 9563 Y 2077 b f c 1861 3889 V 6517 W U X f 9195 9531 R W E b 1289 9529 P 2581 5439 B c f 2877 U 7979 8645 1729 e X 1391 l 233 2815
Output (English): 1, 3, 7, 8, 10, 15, 16, 21, 22, 24, 25, 29, 31, 32, 33, 36, 38, 39