Task: Program Execution
Input (English): zPtWFlRUvbaTGGyzWQJKmGnorrBKNh, dKPWbaTGGyzWQJKmiXsYMYCXWBGM
Output (English): a, b, f, g, h, j, k, l, m, n, o, p, q, r, t, u, v, w, y, z