Task: Program Execution
Input (English): 4637 f 2639 8623 w e k 5503 x 6633 7553 1455 u 1773 r u 1489 u 1303 9683 z 565 7041 x z 9431 k v j z 5469 5665 4089 4951 8263 5675 4095 7745 z 2437 d e w
Output (English): d, e, f, j, k, r, u, v, w, x, z