Task: Program Execution
Input (English): c 4481 5035 x z 9035 2641 b 591 n 6045 9117 4731 807 7069 d 1735 6971 4823 j v 63 u x 4925 c b 7089 w m q r 5287 c 4443 d g 8943 2367 h 3391 d w c b
Output (English): b, c, d, g, h, j, m, n, q, r, u, v, w, x, z