Task: Program Execution
Input (English): a 121 8171 Z 9195 6775 787 R 1037 P 5619 7007 G x k 3379 4315 6357 g e 2321 6613 467 d r 6661 6033 O p 6769
Output (English): 2, 3, 5, 6, 7, 9, 11, 12, 16, 17, 18, 21, 22, 23, 26, 27, 30