Task: Program Execution
Input (English): f 9027 z 9601 w 7747 1135 j 1871 d u f d x k 2009 t 4625 m 1619 m m 3107 x 3957 2495 j 201 a 4635 r 7407 b r z
Output (English): a, b, d, f, j, k, m, r, t, u, w, x, z