Task: Program Execution
Input (English): 6991 5147 2615 949 d 4081 C z 5293 1291 5891 S 1949 4859 O 7453 9791 7333 329 J t 9857 O 4785 2657 3811 3763 Z 15 1859 6399 1567
Output (English): 5, 7, 8, 12, 15, 20, 21, 23, 28