Task: Program Execution
Input (English): 3975 4263 Y s 5701 C i e c 7137 8823 U e 8957 9215 1443 8999 3847 y 9 8843 L t s 891 O 1417 R N
Output (English): 1, 2, 5, 10, 11, 14, 15, 16, 17, 18, 20, 21, 25, 27