Task: Program Execution
Input (English): 9503 z 207 1877 2451 9697 u 8663 5443 u e h 4173 l b h 8185 9901 6473 f 5875 v l w 8665 n e 8629 x 6155 4353 7381 c
Output (English): b, c, e, f, h, l, n, u, v, w, x, z