Task: Program Execution
Input (English): 4021 5537 a 6659 5537 1817 S O 7695 W t 9767 n K A x 1059 B z 2539 1043 X h P o K 6651 8799
Output (English): 3, 7, 8, 10, 11, 13, 14, 15, 16, 18, 19, 22, 23, 24, 25, 26