Task: Program Execution
Input (English): mvkGsWdBurcuVxdRnFoNvzBIUhkvUoQ, oLerthurcuVxdRnFoNGMiGSRm
Output (English): b, c, d, f, g, h, i, k, m, n, o, q, r, s, u, v, w, x, z