Task: Program Execution
Input (English): 3969 t 6209 v x 6217 4233 r 5619 q 171 8603 7277 v a 1525 c 3487 4429 2699 8989 z u w 6053 2145 f 3593 9367 k 1319 1469
Output (English): a, c, f, k, q, r, t, u, v, w, x, z