Task: Program Execution
Input (English): 4317 Q 7171 2061 G 4463 2601 C 5021 3431 b 3741 9439 O N D W g b 2229 n g u 7501 Z 5215
Output (English): 2, 5, 8, 11, 14, 15, 16, 17, 18, 19, 21, 22, 23, 25