Task: Program Execution
Input (English): 1687 8187 5365 b 2605 7077 D 5239 z S 8629 6895 191 u i 6605 2345 821 9657 5123 F 2783 8505 l l 9001 8135 a 4913
Output (English): 4, 7, 9, 10, 14, 15, 21, 24, 25, 28