Task: Program Execution
Input (English): PkovbHYnsPLqPzcvhyychSugHT, ElaYzyhwUTvHYnsPLqPzcvFrzkrGmaG
Output (English): a, c, e, f, g, h, k, l, m, n, p, q, r, s, t, u, v, w, y, z