Task: Program Execution
Input (English): I s 6031 N 7037 N t 1421 2649 3973 W J 2811 e t 6939 x 1809 2597 5303 S f y P J p l 5089 X O 335 o k U 1913
Output (English): 3, 5, 8, 9, 10, 13, 16, 18, 19, 20, 28, 31, 35