Task: Program Execution
Input (English): B l 8713 8285 e 4651 3987 8387 4255 4353 2585 767 687 f r v 6563 1117 4493 z a 7 e 235 i
Output (English): 1, 2, 5, 14, 15, 16, 20, 21, 23, 25