Task: Program Execution
Input (English): o r l x 5125 3823 l 639 2809 i o j 1919 n 457 q 3403 x i j c l 2835 q l g f 9425 n 4367 r 4585 e 6327 6587 a 905 p 2827 z n u 8521
Output (English): a, c, e, f, g, i, j, l, n, o, p, q, r, u, x, z