Task: Program Execution
Input (English): 6981 q 1799 7287 4565 z 771 a 4635 j k 3225 6279 w 97 497 895 5769 627 3823 x 6773 3857 6709 5343 6889 n 7377
Output (English): a, j, k, n, q, w, x, z