Task: Program Execution
Input (English): 9703 1875 3767 7537 4509 5645 z l 3747 1897 3849 6973 e m k k 4053 g t 4341 6811 e 1979 8413 i 2315 a w p 1939 4879 1337 x u
Output (English): a, e, g, i, k, l, m, p, t, u, w, x, z