Task: Program Execution
Input (English): 7301 7999 x r 6881 e 609 s 7495 a s 1961 q x 373 6289 4847 5969 t 5487 7639 9039 2395 b d 1447 s 8137 s 443 f z 4823 k i o 4739 w f 8853 a
Output (English): a, b, d, e, f, i, k, o, q, r, s, t, w, x, z