Task: Program Execution
Input (English): 4687 8871 b 3503 z 5599 3247 B S 1941 c t 5089 8821 4129 3449 F j F c 895 S N T 6709 6047 k Y 4997
Output (English): 3, 5, 8, 9, 11, 12, 17, 18, 19, 20, 22, 23, 24, 27, 28