Task: Program Execution
Input (English): 2353 Z c Z 21 z S 9689 6121 3247 I 9481 t 1999 S 7925 T E 1423 t H 7565 1393 U K 355 z 5079 9025 1441 9609
Output (English): 2, 3, 4, 6, 7, 11, 13, 15, 17, 18, 20, 21, 24, 25, 27