Task: Program Execution
Input (English): z h p x w 973 r x 8901 l i p 6597 9199 r 9607 c 2603 6703 7471 p l o p n m g 2601 9751 m 2645 9439 1373 e 7753
Output (English): c, e, g, h, i, l, m, n, o, p, r, w, x, z