Task: Program Execution
Input (English): R 7521 7391 657 4285 6299 8147 b 4545 9601 7681 807 R Y Z W I a X 1479 O C 231 N 649 y 8863 3957 n n f 7373 l 333 5215 8169 9763 e s
Output (English): 1, 8, 13, 14, 15, 16, 17, 18, 19, 21, 22, 24, 26, 29, 30, 31, 33, 38, 39