Task: Program Execution
Input (English): 9717, p, e, e, v, k, 2149, p, 3373, h, x, w, 9899, 8635, c, 6223, f, 4065, t, 843, 999, l, 7551, w
Output (English): c, e, f, h, k, l, p, t, v, w, x