Task: Program Execution
Input (English): 8537 Y 6071 9927 z V 4125 Z a 759 7929 1021 9981 j 8713 J 8711 3177 F I 8303 t Z 6991 P 987 U c
Output (English): 2, 5, 6, 8, 9, 14, 16, 19, 20, 22, 23, 25, 27, 28