Task: Program Execution
Input (English): 3973 a S 9741 7659 g U 3963 C Q O s 1359 8593 J Y 8059 S 1971 8879 9891 7925 t q D X i 7049 a 1297 I 5147 w x
Output (English): 2, 3, 6, 7, 9, 10, 11, 12, 15, 16, 18, 23, 24, 25, 26, 27, 29, 31, 33, 34