Task: Program Execution
Input (English): 8589 1489 2371 617 y 9791 2535 419 3817 f 7237 e 7167 9999 v z 8475 t 751 5471 2539 9693 z k 3983 b h q o b
Output (English): b, e, f, h, k, o, q, t, v, y, z