Task: Program Execution
Input (English): 4253 l Q 8613 r 8923 9265 H P l c B 5923 I 9851 W Y 747 9401 x 6671 D 3197 7311 3807 V R 6005 f p x P 1989 1557 7985 M 1801
Output (English): 1, 4, 6, 7, 13, 15, 18, 19, 21, 23, 24, 25, 28, 33, 34, 35, 37