Task: Program Execution
Input (English): 9781 x 6811 2387 9251 3931 8799 x y q o 2163 5275 q e u i 613 n u 649 k n 4855 1995 3067 m f i 6611 5975 201 a 6541 i f
Output (English): a, e, f, i, k, m, n, o, q, u, x, y